He was left on the bench in Saturday's 1-1 draw against Genoa as Max Allegri rotated his side, though - along with the Likes of Giorgio Chiellini - was expected to come back into the team for the visit to Old Trafford.
"That's the way we have got to do it, like we did in the second half against Newcastle and for 60, 65 minutes of this game against Chelsea and as long as we play that way then I am sure we will get the right result".
As well as scoring five for Juve, he netted 84 times in the Premier League while at United and scored a whopping 311 La Liga goals for Real.
He tapped in after Joao Cancelo's shot was blocked - having earlier hit the post with a header.
Lionel Messi is next best on 389.
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Police presence was heavy Saturday evening in neighborhoods a few miles east of Stone Mountain. "Toney to cover", police said. This is the fifth death the Gwinnett County Police Department has experienced in the line of duty.
Genoa were threatening to pull level in the opening stages of the second half, which prompted Allegri to introduce Douglas Costa for Juan Cuadrado.
Napoli cut the gap on Juventus to four points with a third successive win in all competitions and a third clean sheet in a row after a 3-0 win at Udinese.
There were further chances for Ronaldo, Miralem Pjanic and substitute Paulo Dybala but Genoa stood firm to earn an unexpected point.
The hosts had beaten Frosinone, Empoli and above all city rivals Lazio and had been hoping to improve on their sixth place in Serie A ahead of Tuesday's home Champions League game with CSKA Moscow.
Less than five minutes later, he scored.
SPAL took the lead from the penalty spot after 38 minutes.