"They are putting a pin in to make sure it heals straight," Lucas said.
Instead of missing four to six weeks as initially projected, the 31-year-old says to tack on another week. So the new timeline is roughly five to seven weeks.
Lucas suffered a non-displaced fracture to the back of his left hand on Thursday in a Spring Training game against the Cardinals at Roger Dean Stadium in Jupiter, Fla.
The break occurred literally hours after Lucas was told he had made the team as the primary utility player. Donovan Solano was recalled from Triple-A New Orleans, replacing Lucas in the role.
Lucas and second baseman Rafael Furcal (left hamstring) are the two Marlins to start off the season on the 15-day disabled list. Both were at Marlins Park on Tuesday, getting in some conditioning.
Furcal took ground balls at second base and did some hitting. The team still is being cautious, and he isn't expected to be back until at least the middle of April.
Lucas was running the ballpark steps and doing his conditioning.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter