Chelsea midfielder John Mikel Obi will be out of action until April after undergoing minor knee surgery. The Nigeria international has been absent for Chelsea’s past four matches, including Sunday’s 2-0 victory over Tottenham in the League Cup final. Manager Jose Mourinho has subsequently confirmed that Mikel has had an operation to correct the issue and expects him to be absent until April. “Mikel had a little surgery on his meniscus,” he told the press. “We are expecting him to be out for about a month – one week is already gone. There is not too much optimism or pessimism. “I would say he will return first week of April.” Mikel is now likely to miss the Premier League matches against West Ham, Southampton and Hull City as well as the home leg of their Champions League last-16 tie against Paris Saint-Germain.