Mhango, who was originally sanctioned for spitting in the face of AmaZulu midfielder Michael Morton in September, put in a man-of-the-match display in the 1-0 defeat of Celtic at Princess Magogo Stadium on Saturday.
"It's been a long time since I played a match in terms of featuring week in week out, but I couldn't play because of what happened last time," said Wits' top scorer in 2016/17 with 10 goals.
"On Saturday I was hungry because I haven't play so I tried my best. But I have to thank my teammates first for coming back stronger after six games and this is best for the team. And going forward, it's about building confidence from there."
Asked why the Students are struggling in the league this season, the Malawian feels their Premiership and MTN8 success last term has been a factor.
"I think cup games come once a year and it's about fighting all out, but the focus now is on the league," Mhango said.
"The whole team has been struggling and I think we were too excited that we were champions last season. By doing so every team has targeted us and that makes every game not easy for us, but we need to fight.
"We have a game on Wednesday so we need to take each and every game with honesty."
Wits are propping up the table with nine points from 11 games, and next host fellow strugglers Ajax Cape Town at Bidvest Stadium on Wednesday (19h30).