Elliott (right) celebrates scoring in pre-season

The Millwall midfielder, 21, had been linked with a move away, but the Lions boss has dismissed rumours that he is being courted by Reading or Charlton.

"There's no truth in that - Marvin's here, he plays well, he trains well and hopefully he'll get better here.

"And I don't think he's ready to be a Premiership player yet," Spackman said.

The manager's comments came on the back of a statement from Elliott's advisor, Tony Finnigan, rubbishing reports that he was set to go to the Madejski.

"We can clearly state that Marvin is not talking to Reading," Finnigan said. "I had a conversation with (Reading manager) Steve Coppell, and although he admitted liking him he told me he would not be making a bid.

"As far as we know this situation has not changed. There is interest from several clubs and Marvin obviously wants to play at the highest level.

"However, he is a Milwall player and will continue to give his all for them until they state otherwise."

Spackman has no intention of doing that as Elliott is integral to his plans as he looks to guide Millwall back to the Championship following their relegation from the Championship.

"Marvin's getting better all the time, he has great energy levels and when you give him a job to do he's disciplined and an excellent player," Spackman added.

"He has a lot of work to do on other things but he's working hard in training and if the lad keeps improving he could end up being a Premiership player one day."