MILWAUKEE — Brewers pitcher Yovani Gallardo might have torn a ligament in his right knee during a collision near first base on Thursday, general manager Doug Melvin said, and will miss an extended portion of the season.

Melvin said today that Gallardo might need surgery.

He was injured in the fifth inning of Thursday's game against the Cubs when he rushed toward first base to cover a slow roller by Chicago's Reed Johnson. As Brewers first baseman Prince Fielder went to apply a tag, Gallardo hurdled Johnson and landed awkwardly on his right leg.

Gallardo stayed on the ground for a few minutes, but managed to walk it off and keep pitching, completing the inning and another before leaving.