The 21-year-old played a starring role in the SPL giants' 4-0 victory over Dundee United at Celtic Park, striking the hosts' second-goal on a comfortable evening in Glasgow.
Old Trafford boss, Ferguson, was spotted in the Parkhead crowd as Neil Lennon's side romped to an emphatic win, while his Red Devils squad continue preparations for this weekend's FA Cup fourth round clash against Fulham, more than 4,500 miles away in the sunnier climes of Qatar.
Manchester United are believed to be just one of a host of potential suitors for Wanyama, who arrived in Scotland in 2011, signing from Belgian side Beerschot.
He has played an instrumental part in helping Celtic qualify for the knockout stages of this year's Champions League, and Lennon has frequently stated his desire to retain Wanyama's signature.
Only last week, the Bhoys boss slapped a £25million valuation on the player's head, before admitting that an offer of that size would be too good for the club to turn down.
"If a bigger and more productive club came in and the offer is right then we will seriously look at it," Lennon is quoted by the Scottish Daily Record.
"I don't want to stop their progress. I will shake his hand and say 'good luck to you son'. Just so long as we get about £25million."
The Celtic manager added: "Obviously, the longer we leave it, the more vulnerable we become or the more he is an attractive proposition for a bigger club. [But] he has another two years on his contract so we have time on our side."
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