Sergio Aguero
Sergio Aguero limped off in the first half at Selhurst Park and will miss the start of City's European campaignGetty Images

Manchester City striker Sergio Aguero will miss the club's Champions League opener with a knee injury. The Argentina international limped off after 25 minutes of Premier League leaders' win at Crystal Palace and will miss the game against Italian giants Juventus but could be available for the visit of West Ham United.

Raheem Sterling and David Silva, who were both absent from the squad for the 1-0 victory at Selhurst Park with hamstring and ankle problems respectively, are available again. Manager Manuel Pellegrini has also calmed fears over the fitness of Fernandinho and Samir Nasri after the pair were absent from training ahead of the game against the Serie A champions.

"[Aguero] is not fit for tomorrow," Pellegrini told a pre-match press conference, according to the Manchester Evening News. "He has an injury to his knee. I hope he will be OK for the weekend but we must wait to see the result of the scans. [Fernandinho and Nasri] are not 100% recovered from problems but I hope both will be 100% for tomorrow. Silva and Sterling are fit.

"When you have choose your squad for season it's important to have two players for every position. We have injuries, it's difficult with the amount of games and intensity of the Premier League not to have injuries. In this case we have a lot of problems, but I trust this squad 100%."

Despite being handed a daunting group that includes Juve, Sevilla and Borussia Monchengladbach, City welcome a Massimiliano Allegri side who have not won a league game this season. Nevertheless, Pellegrini is expecting a tough game against the 2015 runners-up.

"We are not thinking where we are going to get to in this year's Champions League we are just thinking about tomorrow," he added, according to the official City website. "We want to qualify for the last 16 and after that you must see the draw, the most important thing is tomorrow.

"I think we play against a very strong squad, that's why they won the title four years in a row and made the final of the Champions League," the City boss warned. "Maybe they didn't start that well but they continue to have very good players. If we want to win we must play very well."