Manchester City's leading goalscorer Sergio Aguero is expected to be out for a month with a hamstring injury.
The Argentinian striker hurt his hamstring after scoring the opening goal in City's 5-1 win at Tottenham Hotspur on Wednesday which took City to the top of the Premier League.
It was his 26th goal of the season in only 22 appearances.
He will now miss key games against Chelsea in both the Premier League and FA Cup and at least one leg of the Champions League tie against Barcelona.
The Spanish side are due in Manchester on Feb.18 with the return leg at the Nou Camp on March 12th.
