Martial had made 32 English Premier League (EPL) appearances under previous United chief coach Louis van Gaal netting 11 times to finish as the club's leading scorer.
However, the former Monaco player's progress was stunted following the arrival of Jose Mourinho last summer.
The likes of Swedish star Zlatan Ibrahimovic and young Marcus Rashford have outshone Martial under the Portuguese.
"Anthony's career is quite simply exceptional. He has two years left on his contract, and there is no reason today for him to leave Manchester," agent Philippe Lamboley was quoted as saying by Journal du Dimanche on Sunday.
"I would like every 21-year-old player to have already played 180 games with the pros."
West Ham are rumoured to be chasing Martial's signature.
"If Ed Woodward (United vice-president) calls me to tell me he wishes to see him leave, things will be different. But that's not what he said to me during our last meeting," Martial's agent added.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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