“André al-Hikma was the victim of unjustified assault and theft,” said a statement from Derby.
“He was wounded, and he was hospitalized, as his condition is stable.
“The Merseyside police are investigating and the club will focus its efforts on supporting Andrei and his family.”
Merseyside police did not immediately respond to a CNN Sport request for comment.
Wisdom played in the 2-1 derby victory against Reading on Saturday.
He signed for the club from Liverpool after a series of loan periods and has played 20 games so far this season.
Derby has an outside opportunity to make the championship finalists as the club seeks to advance to the Premier League.