The 34-year-old former England captain made a winning start to his Derby County career on Thursday night – earning praise from his manager Phillip Cocu after making his debut in the starting line-up as captain.
United’s all-time leading goalscorer got an assist in a fine performance in a 2-1 win over Barnsley.
And Groves was so impressed with what he saw that he is convinced the former United striker would walk into Ole Gunnar Solskjaer’s struggling side, who lost 2-0 to the Gunners on New Year’s Day.
Asked if Rooney would improve Man United’s current midfield, Groves told talkSPORT: “Yes. Undoubtedly. He would, 100 per cent.
“He’s better than Fred and he’s better than [Nemanja] Matic. Is he better than Lingard? I’m better than Lingard!
“Wayne Rooney is that good, he can still play in that United team.
“He reminds me of Paul Scholes. He used to be a player who got in the box, then as he got older he had to drop a bit deeper and started being the playmaker.
“Rooney can do that in a heartbeat. He would improve United, 100 per cent.”