15' GOOD SAVE! Mount finds some space in the box and tries to deceive Onana by going for the near post, but the keeper reads him superbly and makes the save. Corner to Chelsea, but nothing comes from it.
3' Tomori is caught in possession as Van de Beek feeds Promes on the left. He returns the pass back inside to Van de Beek, but the assistant has flagged for offside. An early reminder of how dangerous Ajax are on the break.
2' Chelsea with an early corner - Hudson-Odoi to take, but Onana leaps into the air and punches clear.
1' KICK-OFF! We're underway!
86' GOAAAAAAL! CHELSEA LEAD LATE ON! It's substitute Batshuayi with a wonderful finish that hits the underside of the crossbar on the way in! The cross was behind him and he did extremely well to make proper contact with the ball. A massive goal for Chelsea!
81' CHANCE! Pulisic now is the next to try and test Onana, cutting inside from the left and getting a shot away, but it's wide. Chelsea are just upping the pressure a little as the game reaches the end.
74' No goal for Promes, but plenty of promise in his performance - he makes way for Neres.
71' Substitution Kevin Oghenetega Tamaraebi Bakumo-Abraham Michy Batshuayi Tunga
62' Just over an hour gone and that Alvarez header was Ajax's first real chance of the game - barring their disallowed goal, of course. Chelsea have been sloppy at the back and Ajax seem to be edging closer to finally taking advantage of that.
54' Willian with a header to Mount at the edge of the box, back to Willian, but he turns back to Azpilicueta as Chelsea look to switch the point of attack. They work it around to Hudson-Odoi, but he loses out to Dest this time.
46' KICK-OFF! Ajax get the game back underway, but will there be a goal?
41' Van de Beek tries to find Ziyech with a deft flick over a compact Chelsea defence, but it's deflected out for a corner. Ajax play short and end up losing possession - Mount is on his own though and is forced to halt the counter.
35' There's a suspicion of offside against Promes in the build-up to the goal and it's been disallowed!! No goal!
35' GOAAAAL! AJAX LEAD! They catch Chelsea napping from a very smart throw! Ziyech takes, combines with xxx for a one-two and then picks out Promes at the back post with a sublime cross for a simple tap-in.
27' WIDE! Alonso crosses towards Abraham, but it doesn't reach him and instead falls perfectly for Hudson-Odoi to strike - he hits it on the half-volley and can't find the target. That's a good chance!
22' Chelsea are on the attack here though, Abraham wide to Hudson-Odoi, but Ajax clear and try to launch a counter of their own.