Mousset was recalled to the United starting line-up to face Norwich after dropping to the bench for the Newcastle game in midweek, but was taken off after 65 minutes.
And Wilder revealed the striker had missed training in the build-up to the game after suffering a bereavement back in France.
"We had to pick a team for Thursday but we thought this was a game for David McGoldrick and Lys," Wilder said.
"He [Mousset] will be okay. He didn't train much late on in the week, which was disappointing, but he'll be fine. The bereavement hit him quite hard but he wanted to play at Norwich."
"It's a group I'm very proud of," added Wilder, after goals from Enda Stevens and George Baldock gave the Blades the points in Norfolk.
"We showed what we're about with a huge result to stay in the top ten. Even though we're always looking forward, we have to be careful that one defeat doesn't become two.
"I rarely say this, but the better team lost on Thursday and we had to come roaring back. It was a big result for us."
Mousset, a summer signing from AFC Bournemouth, is United’s top scorer this season with five goals. He has also cemented his position as a firm fans’ favourite with United supporters.