Morales, who was a swing man for the Red Sox earlier this season, is coming back as a reliever and could be an important piece with Andrew Miller done for the season.
Morales, who last pitched for the Red Sox on June 22 and has been out with a left pectoralis strain, will throw an inning for Pawtucket on Monday. Wilson, who has been out since July 9 with a right thumb strain, will get his inning Tuesday.
Wilson figures to make it back to the Red Sox sooner because he's been out for less time.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.