18-year-old Wilson, who is predominantly a right-back, joined the Saddlers on loan in August and went on to make twenty first-team for the club, in all competitions, and will now be looking to secure a loan move to another club.
Fellow Baggie Fitzwater, who is enjoying his second spell at Banks's Stadium, has been recalled by Albion for their Emirates FA Cup - Third Round tie against Wigan Athletic, after which he will rejoin the Saddlers on loan until the end of the season.
The 21-year-old has been a regular fixture for the Saddlers this term, making twenty-five appearances and scoring one goal, in a 3-1 Checkatrade Trophy victory over Middlesbrough Under-21s.