The Man City ace scored the second goal against the Red Devils but his Etihad future is the subject of speculation.
In particular, the retired striker raved about Leroy Sane, admitting that the Red Devils simply could not handle him after Pep Guardiola brought him on off the substitutes' bench at Old Trafford.
Man City ran out 2-0 winners over their rivals as Bernardo Silva, on his 100th appearance for the club, drilled a low shot from 15 yards beyond David de Gea at his near post on 54 minutes.
Just 12 minutes later the visitors doubled their lead with another low effort, this time from Sane, despite De Gea getting a touch on the effort with his right foot, and they saw the game out to return top of the table.
Speaking about Man City's midfield, Shearer told the Premier League website: "It might look light but I tell you what the ability these guys had in receiving the ball under pressure, being able to handle the ball under pressure, no panicking whatsoever.
"They draw you in, they play those little passes around you and they play it forward, and when Sane came on he gave them a bit of width and pace, and they couldn't handle him."
Sane's future at the Etihad Stadium is currently the subject of speculation, with The Metro having reported earlier this week that the club fears their player's head might be getting turned by offers from elsewhere.
The Germany international has two years to run on his existing deal with the Premier League title hopefuls but contract negotiations are believed to still be ongoing - given Shearer's comments on him, it shows just what a great player he is, and Man City must do all they can not to lose him.
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