The Portuguese coach was sacked as national team manager last
week after he was banned for six months by Portugal's anti-doping
authority.
He was alleged to have insulted drug testers as they arrived at
Portugal's pre-World Cup training camp ahead of their departure to
South Africa.
Queiroz, 57, who is appealing the verdict to the Court of
Arbitration for Sport, then presided over a poor campaign in which
his side were knocked out of the competition in the second round by
bitter rivals Spain.
But the former Real Madrid coach's players all tested negative
and he is only banned from working in Portugal.
He is still highly regarded by Fergie after the pair won three
Premier League titles and the Champions League together.
His return would see a restructuring of United's coaching
set-up, with Mike Phelan reverting to a coaching role alongside
Dutchman Rene Meulensteen.
Queiroz arrived at Old Trafford in 2002 and helped United win
back the title from Arsenal in his first spell, which lasted just
one season.
He then took the Real Madrid job just one week after David
Beckham's move to the Bernabeu but returned to United 12 months
later and stayed for a further four years.
Fergie has credited him with giving the club's transfer policy a
more international dimension.
