Wilson tore the tissue from the knuckle of his left middle finger while hitting a double in the Pirates' loss to Arizona on Friday and then sat out Pittsburgh's 3-1 victory Saturday night.
"He's swinging the bat extremely well right now," Pirates manager Lloyd McClendon said. "Collectively as a team we need to go out and pick up the slack. The players need to play better, the pitchers need to pitch better, the coaches need to coach better and I need to manage better."
Wilson, who will return to Pittsburgh on Sunday for further evaluation, is hitting .296 with one home run and seven RBI in 26 games and has reached base safely in 13 of his last 19 plate appearances.
To replace Wilson, the Pirates will recall outfielder Ray Sadler from Double-A Altoona.