The Turkish club signed Waris from Spartak Moscow in the close-season, but United are taking a keen interest in the 23-year-old's progress, with Ryan Giggs watching the striker in action during Trabzonspor’s Europa League clash with Lokeren last week.
Waris’ agent recently revealed to Goal that he was unsurprised by United’s interest, although he was not aware the club had travelled to watch his client in action.
"I wasn't aware of Manchester United travelling to the Europa League fixture - but Premier League interest does not surprise me," he said.
And Gurdal has now confirmed that United are keeping tabs on Waris, though he maintains the club have no interest in selling.
"We have not have any direct offers however, we know Manchester United are scouting Waris and keeping close tabs on him,” Gurdal is quoted as saying by the Manchester Evening News.
"Not just Waris, we have a few players are being closely watched.
"We only signed Waris two months ago and are not interested in selling right now, but you never know what will happen in the future."