"We felt like a two-inning reliever is what we needed, which Alex has done. He has a familiarity with the role and that is why he is here," said manager John Farrell.
While the right-hander is expected to be with the club for only a small chunk of time, he's going to do his best to stand out.
"I'm not sure how I'm going to be used, but I'm just going to try to provide a consistent arm while I'm here and hopefully it will be longer than shorter," said Wilson.
Wilson's held right-handers to a .063 average with Pawtucket this season. Opponents are also 0-for-7 with runners in scoring position against him this season.
With the Red Sox in 2013, Wilson went 1-1 with a 4.88 ERA in 26 games. He struck out 22 batters in 27 2/3 innings.
"It's always a confidence boost. It's always great to come back. It definitely makes you feel good," Wilson said. "Every time out, I feel like it's an audition for me to keep proving to everybody what I can do."