Thomas Tuchel has explained the reasoning behind withdrawing Callum Hudson-Odoi in the second half of Chelsea's draw with Southampton, explaining that he was unhappy with the half-time substitute's energy at St Mary's Stadium.
Tuchel wrung the changes at the break, introducing Hudson-Odoi from the bench for Tammy Abraham. The 20-year-old has impressed under the German since his arrival, being deployed at wingback, slightly deeper than his usual attacking role.
However, Hudson-Odoi was withdrawn 31 minutes into the second half, leaving the Englishman frustrated as he begrudgingly made way for Hakim Ziyech.
And Tuchel has explained that the substitution was not the result of an injury but a tactical tweak, with the German unimpressed with Hudson-Odoi's second-half impact.
'[It was] hard for him [Tammy Abraham] to show his quality and we weren't happy with last 20 metres and he could not put his stamp on this game so we changed the formation' Tuchel explained after the game.
'So we brought in Hudson but with Hudson, I was not happy with the energy and with the attitude and counter-pressing so we decided to take him off again as we demand a lot.
'We demand 100% and I had the feeling he was not right in this shape to help us so it's a decision for today. It's a hard decision for players to come on and off but tomorrow it's forgotten and he has all possibilities to start against Atletico.'
The Blues' winning run under their new boss came to an end on Saturday after a Mason Mount penalty rescued a point for the west London side on the south coast.