Manchester City are hoping for positive news regarding an injury picked up by Vincent Kompany, but concede that he is set to take in a spell on the sidelines.
The Blues saw their club captain forced from the field during their 1-0 Europa League defeat by Sporting Lisbon on Thursday.
The Belgium international lasted less than 10 minutes of that contest before picking up an unfortunate knock.
With no-one around him, Kompany pulled up when accepting a pass.
He immediately signalled to the bench that his evening was over, with a calf problem making it impossible for him to continue.
Roberto Mancini is keen to see the centre-half return to his plans as soon as possible, as City continue to chase domestic and European honours, but admits Kompany is likely to miss at least two games.
"I hope that for Vinnie, the injury will be short," said the Italian.
"When you have a calf (injury), it can be a big problem. I hope he can recover in 10 days, two weeks maximum. We will see how it is in another one or two days."
City face Swansea in their next Premier League outing on Sunday, before tackling Sporting in the return date of their continental clash next Thursday.
Kompany is likely to miss both of those games but he could be back in time for a crucial meeting with Chelsea at the Etihad Stadium on 21st March.
While the club wait to discover the full extent of his injury, they have received better news regarding the fitness of Micah Richards.
The England international was not risked against Sporting, allowing him to rest a minor knock, but he is set to figure against Swansea at the Liberty Stadium.
"I didn't take a risk with Micah because Pablo Zabaleta is injured. Micah will play on Sunday," added Mancini.