Coghlan, who won the top rookie honor in 2009, made a start in left field on Thursday at Cincinnati because Logan Morrison was given the day off.
On Saturday night, Morrison was back in left field, and Coghlan is preparing himself to go whenever called upon.
"My role has changed, but my mindset hasn't," Coghlan said. "I prepare like I'm going to play. The only thing that's changed is I have to be ready for the first inning or whenever I come in."
Most likely, Coghlan will have his chances because the Marlins, at least early in the year, are monitoring Morrison, who had surgery on his right knee in early December.
Because the Marlins played on Wednesday night and followed that up with a day game on Thursday, manager Ozzie Guillen opted to give Morrison Thursday off.
With the team also off on Friday, Morrison got a two-day breather to rest his knee.