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Chelsea went into the break two goals behind, as Ajax led 3-1 at halftime.
Ajax increased their lead early in the second half but the Blues fought back to snatch a 4-4 draw against Ajax.
Chelsea boss Frank Lampard has revealed he told his players at halftime that Chelsea could snatch a point against Ajax or even beat the Dutch champions.
“The two own goals were the story of our first half. We were in the first half,” Lampard told BT Sport after the game.
“I said to the lads at half-time – I’m not trying to say how clever I am – but I said, ‘I think we’re going to draw this at least 3-3, could be 4-4, could be 4-3 and we could win it. It’s up to us.’
“Because if we got rid of those crazy moments that gave them the goals – some misfortune, some on us – I just felt we were so in the game.
“We were just short of that last pass in the final third, Christian Pulisic looked so dangerous, Willian looked dangerous and I just thought we’d build momentum and fortunately we did.”