AS says United are monitoring Lemar's situation at Atletico Madrid.
A move to the Premier League could be on the cards after the Frenchman has failed to impress since his move from Monaco.
They claim United and Arsenal are both watching how things develop.
Arsenal are calling on Jorge Mendes to help negotiate a deal with Atletico for Lemar.
The France attacker is a loan target for the Gunners.
Mendes is the Gunners' "most trusted agent", and they are relying on his help to get a deal done.