Manchester City boss Manuel Pellegrini says Yaya Toure and David Silva were both injured for the FA Cup win against Norwich but expects the duo to return against Everton on Wednesday.
City proved themselves a class above at Carrow Road as goals from Sergio Aguero, Kelechi Iheanacho and Kevin De Bruyne sealed the visitors' passage into the fourth round.
Pellegrini made seven changes to his starting line-up, in what looked like a ploy to rest players, but the Chilean later revealed it was injuries that forced his hand.
City can ill-afford to lose any more key names, with captain Vincent Kompany, Eliaquim Mangala and Samir Nasri all on the sidelines, while Aguero has only recently returned from a heel problem.
Pellegrini hopes, however, Silva and Toure will both be back against Everton, along with Fernandinho, who was also unavailable.
"We couldn't play with Mangala, Kompany, Fernandinho, Yaya, Silva and Nasri because of injury," Pellegrini said.
"But I hope at least Yaya, Fernandinho and Silva will be back on Wednesday."
The win at Norwich was only City's second victory in eight away matches and Pellegrini was pleased to answer the criticism about his team's form on the road.
"Maybe we had a lot of criticism in the last week because we were not winning away but I am always very happy with the way we play away," Pellegrini said.
"We try to do the same things, to play attractive football.
"I think the fans enjoy our football and today we demonstrated it doesn't matter who plays, the mentality is always the same."
Norwich must now turn their attention back to the league as they visit Stoke on Wednesday, before a crunch clash against Bournemouth on Saturday.
"We've got to move on because we've got a big month ahead of us," striker Cameron Jerome told Norwich TV.
"Playing against a side like Manchester City, it was always going to be a tough ask to get through.
"We did some good things in the game, but there's disappointment in the dressing room. I think we had some good spells, although once they got a couple of goals ahead we were chasing the game.
"It would have been nice to make the next round, but there's no disgrace in losing to a team like Manchester City."
The Canaries have climbed six points clear of the relegation places after winning three out of their last four league matches.
"The league is our bread and butter, so we'll focus on that now," Jerome added.
"We've done really well recently and need to take that form on. There are two tough games in a week away from home coming up so it's vital we pick up points."
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