Baxter missed the last two Absa Premiership games for United, a 1-0 win over Bidvest Wits and the 2-2 draw at home against Kaizer Chiefs, after being afforded sick leave by the club.
United spokesperson David Skhosane has since confirmed to this website the return of Baxter in the dugout for tomorrow's clash against Siwelele.
"The coach is back in camp,” Skhosane tells KickOff.com.
"He will be on the bench tomorrow [Wednesday] against Celtic,” he adds.
Matsatsantsa will be need nothing less than the three points again Celtic if they are to maintain their bid for a top-three finish, with SuperSport currently fifth in the standings and eight points from third with five games remaining this season.