Redknapp was appointed as a footballing advisor for Derby last week, and the 69-year-old has already been quick to dismiss suggestions that he could become manager at the iPro Stadium.
Redknapp was in Derby’s dressing room at every opportunity during their match against Forest, but Wassall says that the former Queens Park Rangers boss was only in there on his request.
"Well, we speak as a group of people,” Wassall said, when asked whether Redknapp said anything to Derby’s players at half-time.
“I do the talking but Harry's input is invaluable. We're a team here, and we work together. I wanted Harry in the dressing room before the match, at half-time and at full-time.”
The move to appoint Redknapp certainly seemed to work against Forest, as Derby picked up a 1-0 win.
In a close-fought encounter, a late strike from Marcus Olsson proved to be the difference between the two sides.
Derby are now in fifth place in the Championship table, but they are still seven points back from the automatic promotion spaces.
Derby have won four of their first eight matches under the stewardship of Wassall.