Lincecum says he's improving and expects to start either Tuesday or Wednesday. If Lincecum pitches Tuesday, it will be in a minor league game rather than in the Giants' exhibition game against the Brewers.
Lincecum is scheduled to start the regular-season opener April 7 against Milwaukee.
The reigning NL Cy Young Award winner has not allowed an earned run while retiring 20 of the 22 batters he has faced in three exhibition starts. He has given up one hit and one walk.
He pitched 2 1-3 shutout innings Wednesday against Japan's World Baseball Classic team, giving up a hit and three walks, but those statistics aren't included in his spring work.