Shaun Marcum was scheduled to pitch in a simulated game in Port St. Lucie, Fla. today, but was not able to after experiencing neck pain while warming up, the Mets announced. The team says Marcum's status will be reassessed Wednesday. Marcum is scheduled to make his season debut Sunday against the Marlins, but that is now unlikely. The setback comes a day after the Mets placed Marcum on the 15-day disabled list retroactive to March 22. But the injury listed was right bicep tendonitis, which was not an injury the team nor Marcum had said the right-hander sustained. The team and Marcum previously said he was dealing with shoulder and neck ailments, which first surfaced during a bullpen session last Monday. He received a cortisone shot the next day in New York.