Donovan McNabb was told Thursday to have surgery that probably would end his season. The Eagles' quarterback is considering his options. McNabb will miss Philadelphia's game against the New York Giants on Sunday with a groin injury, but hasn't made a decision beyond that. McNabb has played with a sports hernia most of the season. He re-injured his groin while trying to tackle Cowboys safety Roy Williams following an interception on Monday night. Williams returned it 46 yards for a touchdown with 2:43 left to lead Dallas to a 21-20 comeback victory over the Eagles. Dr. William Meyers recommended that McNabb have surgery now to correct the sports hernia after an examination Thursday morning. McNabb had planned to have surgery after the season, but he said Wednesday he wasn't sure if he'd do it sooner. Mike McMahon, who had been the third string quarterback, will start in McNabb's place. "He's our leader. If he's out, it's a major hit," tight end L.J. Smith said. "It's definitely a blow to our offense."