Arsenal will be without midfielder Aaron Ramsey (hamstring) and captain Mikel Arteta (calf) for Wednesday night's Champions League Group D match against Galatasaray, but Jack Wilshere should be fit from an ankle problem.
Striker Daniel Sturridge has not made Liverpool's Champions League trip to FC Basel after failing to recover from a thigh strain in time.
UEFA referees' chief Pierluigi Collina says new concussion rules that come into force in the Champions League this week will clear up any doubts about when players are able to continue after suffering a head impact.
Manchester City boss Manuel Pellegrini says his side finally have the right personality to compete with the big guns in Europe.
When asked what was he was looking for in a Man City team that hasn't been there in previous years, Pellegrini told ITV's Gabriel Clarke: "I want to see personality and this team has the personality."
"Every time you play in the Champions league you have more experience and now we have the personality to go and play away the same as we play here (at home)."
"It was frustrating last year, we won our three games away and now we must continue in this manner, in the same way we played Bayern Munich this year. We didn't win but the team tried to do their best and I'm sure that we will do it - we will qualify.
Joe Hart says Manchester City must be considered as contenders to win this season's Champions League despite losing their opening game to Bayern Munich.
The England goalkeeper, speaking to ITV's Gabriel Clarke ahead of the clash with Roma tomorrow night, insists the Premier League champions can go all the way to the final in Berlin.
"Of course (we are contenders). We are champions of the Premier League, one of the top leagues, and we are champions of it so we should go in confident."
" I think we have improved as a team. We've gained experience...I feel like we have got all the ingredients we just need to put them all together."
Hart is also wary of the threats that Roma possess ahead of the Group E match live on ITV.
"They (Roma) are very good on the ball, they score a lot of goals, they are in a very good moment, they are playing with confidence and they have a lot of pace."
"They are unpredictable, they don't exactly play with a set style of play so it's going to be an exciting game."
Striker Diego Costa and his troublesome hamstring was the only concern for Chelsea ahead of the Champions League Group G clash with Sporting Lisbon.
Paris St Germain suffered a blow on the eve of their mouthwatering Champions League showdown against Barcelona when star striker Zlatan Ibrahimovic was ruled out through injury.