Coach Jim Caldwell didn't give details about the injury, which occurred during Saturday's mini-camp practice at Franklin College. Gonzalez stayed on the field after hurting his leg, but spent the rest of practice stretching it out.
Caldwell said Gonzalez, who's expected to replace Marvin Harrison in the Colts' lineup, could return to the field Tuesday or Wednesday when Indianapolis finishes its scheduled offseason workouts.
Gonzalez is yet another addition to Indy's growing list of injured players. On Sunday, the Colts announced offensive lineman Steve Justice and receiver Sam Giguere are recovering from injuries, too.
Justice had back surgery this past week, while Giguere has been out since breaking a bone in his leg during practice last month.
The Colts didn't say which leg Giguere hurt, but he's expected to be ready for the start of training camp in August. He's competing with Pierre Garcon, Roy Hall and Austin Collie to be Indy's No. 3 receiver.
Justice is the second Colts player to have surgery this past week, joining kicker Adam Vinatieri, who had his right hip repaired earlier in the week. Justice is expected to return when training camp opens, while Vinatieri is expected to be ready for the start of the regular season.
Two other offensive linemen, left tackle Tony Ugoh and guard Ryan Lilja, said they also had offseason surgery. Ugoh had arthroscopic surgery to clean out his right knee and has been practicing. For Lilja, it was the third surgery he's had for a knee injury that kept him out all of last season.