Chelsea are considering launching a £24m bid for United target Gerard Pique.
Blues boss Jose Mourinho is keen to add to his defensive ranks in January and has targeted the signing of the Barcelona defender.
Van Gaal also wants to sign the 27-year-old Spain centre-back, who spent four years at United before joining Barcelona.
Starsport revealed earlier this month that United officials were confident of securing a deal during the winter transfer window.
Abdul Majeed Waris
The agent of Trabzonspor forward Abdul Majeed Waris claims he is unaware of United’s interest in his client.
Reports suggested that United assistant manager Ryan Giggs flew to Turkey to watch the 23-year-old in action.
But the Ghana star’s agent, Phil Radley, insists he has not been contacted by United over a potential move to Manchester.
”I wasn’t aware of Manchester United travelling to the Europa League fixture – but Premier League interest does not surprise me,” Radley said.