Graham Potter says his decision to make a double substitution at half-time of Chelsea’s 2-0 win over Aston Villa was purely tactically and he was delighted with the impact his changes made.Chelsea news, exclusives and analysisThe Blues took an early lead at Villa Park on Sunday as a woeful header from Tyrone Mings allowed Mason Mount to stroke the ball past Emi Martinez, with the midfielder doubling the score – and wrapping up all three points – with a devilish free-kick in the second half.Despite the routine scoreline, Chelsea had to soak up a lot of pressure, particularly in the first half, with Kepa Arrizabalaga keeping his side ahead with a string of fine saves.Potter decided to mix things up at the half-time break, taking off both Marc Cucurella and Kai Havertz and replacing them with Kalidou Koulibaly and Cesar Azpilicueta as he switched to a flat back five.That was no slight on the performances of Cucurella and Havertz, though, with Potter feeling that the side needed to tighten up at the back and in midfield.Asked about the changes, Potter told ChelseaTV after the game: ‘It was more tactically.‘I thought we had to probably be a back five, more so, and be a bit stronger in the midfield area so we just had to adjust it.‘Sometimes [changes] go for you, sometimes they don’t.
Credit to the players, they’re all ready to fight, they’re all ready to help the team.‘So we’re in a good moment at the moment, but we know there’s another game coming.’Potter made two more changes either side of the hour-mark, with Conor Gallagher and Jorginho both introduced to bolster Chelsea’s midfield even more.'Waste of time!' Andy Townsend reveals major concern over Pierre-Emerick AubameyangAubameyang reveals how Alexandre Lacazette