90' + 3' FULL-TIME: ARSENAL 3-0 DUNDALK
90' + 1' We're into three minutes of stoppage time.
89' Cedric's cross isn't properly cleared by Gannon and Tierney's shot is deflected behind. Elneny has a pop from range as the ball is half-cleared again, but he mis-hits it and it goes well wide.
87' Gartland yanks Willock's shirt as he bursts into the area but the referee doesn't spot it and the Arsenal man runs the ball out for a goal kick.
85' Nelson drives infield from the left and aims a powerful right-footed effort toward the far top corner, but it flies just wide.
84' Tierney floats in a cross towards Willian at the far post. Colovic opts not to take a chance and puts it behind.
80' Nelson tees up Tierney at the left corner of the area and he goes for goal with his left foot, but he shanks his effort over the bar.
79' Dundalk are playing a bit of keep-ball now, eager to run the clock down. Arsenal, to their credit, are still pressing and getting forward.
77' Into the final 15 minutes now. Dundalk will be happy if it stays at 3-0.
71' Rogers beats away Maitland-Niles' powerful effort from the edge of the area.
70' Another Dundalk sub. Colovic comes on for Duffy.
68' Cedric crosses from the right and Nketiah looks to hook it in at the edge of the six-yard box, but he can't get a telling touch as Rogers comes out to paw it away.
67' Willock bursts through two defenders in the penalty area and looks to poke the ball home, but Gartland gets an important block in to put it behind. The corner is eventually carried clear by Hoban.
59' Ceballos is being readied on the touchline as well.
57' This probably isn't what Dundalk wanted to see - Willian is coming on. Just the 70 Brazil caps and two Premier League titles for him. Are Arsenal going to start racking up the goals now?
55' Nelson teases in a cross from the right but again, nobody attacks it. It floats over to Maitland-Niles who keeps the move alive, but eventually Nketiah bends a left-footed effort well wide from the edge of the area.
53' And now a third change for Dundalk. Hoare comes on to replace Cleary.
53' Flores is finally on, replacing the injured McEleney.
51' Some concern for the visitors here. McEleney has gone down and is being seen to by the medical team, with Flores being readied. If you haven't seen it before, do yourself a favour and search for his volley against Shamrock Rovers earlier this year. This guy loves a screamer.
50' Dundalk will be annoyed to find themselves three goals down. They have been well organised for the most part and found themselves behind after an individual error, one defensive lapse and one absolute stunner.
49' Duffy lifts in a nice free-kick from deep on the right, but the Dundalk player who meets it can't get a telling touch and Mustafi is able to clear.
48' That's Pepe's 10 goal for Arsenal in all competitions, in his 52nd appearance.
46' GOAL! Wow, barely 30 seconds into the second half and Pepe makes it 3-0! It's a cracking finish, too. Willock finds him inside the D and he holds the ball up, rolls it onto his right foot and spanks it into the top-right corner.
45' + 2' HALF-TIME: ARSENAL 2-0 DUNDALK
44' GOAL! 2-0 Arsenal, Willock smashes in and that could be game over in a flash. Dundalk leave some space in behind for the first time and are punished. Nketiah feeds Pepe and his shot deflects straight into the path of Willock, who lifts a right-footed effort into the roof of the net from the left side of the area.
42' GOAL! Arsenal lead 1-0, Nketiah with the opening! It's a bad moment for goalkeeper Rogers who comes out to punch a corner clear and misses the ball. It drops to Nketiah, who smashes it in from close range.
39' Close again for Arsenal! There's some pinball in the penalty area after a corner and a Pepe shot is blocked into the path of Nketiah, but he can't react quickly enough to stab it home from close range and he puts his snapshot wide.
37' That's as close as anybody has come so far. Willock has a pop from range and his low drive goes through a crowd of bodies, but Rogers falls to his right to make a simple save.
36' Nelson swings in another cross from the left, but Pepe can't stretch enough to keep it in play.
34' A chance! Willock crosses from the right edge of the penalty area and finds Kolasinac at the far corner of the six-yard box. He makes a good connection with his header but Rogers manages to tip it over, and the corner is cleared.
33' Cedric bends in a cross from deep on the right, looking to pick out Nketiah on the penalty spot. It's accurate enough but headed away easily enough. Arsenal seem keen to get crosses into the area but rarely have they had somebody on the end of one.
32' Dundalk win a corner on the left but for the second time, Runarsson comes out to make a simple catch.
31' Pepe jinks into the area and a defender gets a touch to the ball, but can only knock it on to Nketiah. It looks like an opportunity to shoot but he tries to do too much and is closed down.
30' Dummigan gets a good foot in near the corner flag to prevent Pepe getting away from him again. The Dundalk defenders are sticking to their task well so far.
29' Nelson lifts a ball in behind for Nketiah to latch onto in the area, but the flag goes up. That looked tight.
27' Dundalk have lost 15 of their last 18 matches in UEFA competitions. Their last win was against Maccabi Tel Aviv in September 2016.
26' Dundalk put together a rare attack after Pepe loses the ball at the edge of the area, but in the end Mountney puts a cross out for a goal kick from near the right touchline.
16' Dundalk manager Giovagnoli isn't allowed on the touchline tonight as he doesn't have the right pro qualifications. Coach Shane Keegan is there in his absence.
15' Pepe fires a corner from the right straight into the side netting. Nelson drifts a cross from the left straight out for a goal kick. Not a lot of quality so far.
14' Goalkeeper Rogers is forced to pass the ball straight out of play as he's pressed by two Arsenal forwards. It's backs to the wall for Dundalk at the moment.
13' Pepe drifts onto his left foot from the right wing and looks to tease in a cross for Nketiah at the far post, but Gartland hooks it clear. Soon after, Pepe gets the ball in a similar position and goes for goal, but his shot drifts over.
11' A loose ball bounces up for Cedric at the edge of the area, but he has to go with his left foot and he slices his half-volley well over the crossbar.
10' English sides have won 11 of their 12 home matches against sides from the Republic of Ireland in European competition, scoring 56 goals and conceding only five.
9' It has been a low-key affair so far. Arsenal are seeing lots of the ball as you would expect.
7' Pepe picks out Nketiah with a good cross to his feet from the right. He controls the ball and goes down as he's tackled by Gartland, but referee Filip Glova isn't interested in his penalty claim.
5' Runarsson makes a comfortable catch from the resulting corner. Arsenal look to counter but Maitland-Niles is stopped by Shields as he looks to find room for a cross from the left.
4' McEleney tries his luck from range after Shields and Duffy combine to launch a counter-attack. It's a good 30 yards out but he hits it well and draws a decent save from Runarsson at the bottom-left corner.
2' Maitland-Niles makes an early burst forward and spreads the ball wide to Saka on the left, but he's well tackled by Mountney.
1' We're off!