The Pirates on Monday said Wilson will not be placed on the disabled list and they hope he could be available late in the season as a pinch-hitter or pinch-runner.
"We'll just see what he's able to do," Pirates manager John Russell said. "The key to the situation is that he doesn't want to re-injure it. So taking groundballs at short isn't the right thing to do."
Wilson, who missed the last six games, injured the finger Aug. 31 while fielding a ball against Milwaukee. It was believed to be just a bruise then.
Wilson was batting .274 with a home run and 22 RBIs in 299 at-bats this season. He missed about two months with a strained left calf.