In the belief Rooney's fitness levels drop when he misses a game, the Manchester United forward will start Wednesday night's Champions League dead-rubber with CFR Cluj at Old Trafford.
More than once this season, Ferguson has raised the issue of Rooney's fitness.
And even though the England man's most recent absence with tonsillitis only amounted to two games in the middle of last month, Ferguson is not intending the 27-year-old to be one of the star men who gets a rest on Wednesday night.
"Wayne needs to play a lot of games to get his match-fitness up," he said.
"He's a strongly built lad and when he misses two games it takes him three games to come back.
"It's the way he's always been.
"He'll play tonight and hopefully that brings him on further because Saturday was his best performance of the season so far."