City's Nasri fit to face Chelsea
The France international has been sidelined since suffering knee ligament damage in a tackle from Newcastle's Mapou Yanga-Mbiwa five weeks ago.
Nasri rejoined the squad for full training earlier this week and his return, after two games without a win, is timely ahead of next Tuesday's Champions League encounter with Barcelona.
The 26-year-old had been in fine form before being carried off on a stretcher at St James' Park, but manager Manuel Pellegrini does not want to build up his comeback.
Pellegrini said: "He is a very important player, it is impossible not to miss him.
"In the last two weeks I said this was not an excuse because we have had a lot of injuries during the year.
"In the last two weeks maybe we have had injuries in the same position and that has been a major problem.
"Samir Nasri is a very important player and we always miss him, but with the squad we have I think we can also win without him."
Two other key players in top scorer Aguero and midfielder Fernandinho remain on the sidelines but Javi Garcia is also fit again after a muscle strain.
Pellegrini said: "I think it is very important to have Samir Nasri and Javi Garcia fit for this game. It is very important for us.
"(Matija) Nastasic, Fernandinho and Aguero are not fit for this."
City had an unexpected night off on Wednesday as their Barclays Premier League clash with Sunderland was postponed due to inclement weather.
That could affect his team selection for the visit of Chelsea but, with the Barca encounter also at the forefront of his mind, he is cagey about revealing his thoughts.
Speaking at a press conference to preview the match, the Chilean said: "Tomorrow we will see the 11 starters."
Chelsea have twice beaten City in the league this season and Jose Mourinho has experienced defeat against Pellegrini just once in nine meetings in Spain and England.
"I don't like this histories of records between managers, because it's between teams, it's not between managers," Mourinho said.
The proximity of the recent triumph makes the FA Cup challenge difficult.
"It's not easy to play consecutive matches against the same team, exactly because you try to read the previous game and try to improve things and try to analyse the mistakes and try to analyse the opponent again," Mourinho added.
"The game was very equal. Are we confident? Yes, but I believe they are confident.
"Are they worried? I believe so, but we are too."
Mourinho's concerns increased when Cahill failed to come through training on Friday.
"He tried to train," Mourinho said.
"He didn't finish the training session in the best conditions. He's going for a scan."
Ivanovic is likely to be deployed at centre back, Cesar Azpilicueta at right-back and Ashley Cole will come into the side at left-back.
Cole has found his opportunities limited by the form of the Spain right-back on his 'wrong' flank but enjoys the FA Cup, having won the trophy a record seven times.
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