"I am less optimistic than I was," said the United boss
"We've 11 days left before the transfer deadline and we're working at something, you never know in football." added Ferguson
The Premier League and European Champions have also been linked with David Silva, Thierry Henry, Klaas Has-Jan Huntelar and Roque Santa Cruz, who signed a four-year contract with Blackburn Rovers.
Cristiano Ronaldo continues to back up from ankle injury leaving only Rooney and Tevez for attacking's options.
Ronaldo may get back quicker, but United boss does not want to putting him under any pressure.
"We want to let the physios do a good job," added Alex Ferguson
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