The news on the injury front is not looking good for Donegal’s star forward Michael Murphy. The Glenswilly man is in a race against time to be fit for the county’s Ulster Championship preliminary round clash with Cavan at Breffni Park on May 20. Murphy picked up a knee injury against Dublin on Saturday night and he underwent surgery in the Santry Sports Clinic on Tuesday. He will definitely miss his side’s crucial final League game with Armagh on Easter Sunday, and he will have six weeks after that to recover in time for the Championship. It’s understood the damage he sustained was to the lateral knee ligament and recuperation time is estimated between six and eight weeks. It is the second time this year that Murphy has undergone surgery. He was under the knife in January with a groin injury.