The 29-year-old was making his first return to the South Yorkshire club since his 2011 exit and was handed a shirt instead of Benik Afobe.
He played 77 minutes, missing a good chance to get on the scoresheet in the second half, before making way to a standing ovation from the home support.
Le Fondre, who represented the Millers with distinction for just over two years, scoring 54 goals, has struggled to replicate that form at Molineux, finding the net just three times in 18 appearances.
And Jackett admitted Le Fondre got the shirt because he thought it "might be his day".
"It was more about Adam Le Fondre coming back to his former club rather than Benik not playing,” Jackett said.
“I
wanted to keep the same system as I felt we needed to be competitive
and second balls are a big part of getting on top in the game.
“I
felt in the first period we surprised Rotherham a bit and when we did
get the ball down we looked quite potent and a good side.
“That
was what got us the goals which won us the game.
Special mention to the @OfficialRUFC fans absolutely outstanding reception for me! Truly humbled by it! Really hope you stay up!Thank you ❤️— Adam Le Fondre (@A1F1E9) December 5, 2015
“Adam
has probably not had as many minutes as he has deserved because he
has played well for us and his goals per minutes ratio is good as
well.
“He
is a good centre forward and even though he is not the biggest player
he never gives the centre half an easy ball whether in the air or
chasing down the side.
“I
have been impressed with him since he has come in and I felt today
might be his day."
