The Red Devils coach endured a woeful summer in the transfer market, with Marouane Fellaini – a £27.5m deadline day arrival – his only piece of business.
A number of other deals collapsed, which has prompted speculation that the Scot is set to up his activity this winter.
Signing a central-defender is said to be a priority for Moyes, who is growing increasingly concerned by Nemanja Vidic and Rio Ferdinand’s advancing years.
Mangala has emerged as the ex-Everton boss’ main target, with the Frenchman having been impressive for Porto.
The 22-year-old is one of the most sought after players in Europe after emerging as a top talent with the Portuguese champions.
Although he only joined the club from Standard Liege last year, it is thought that he could be open to a big move.
Manchester City, Chelsea and Barcelona are just a few top sides to have been linked with Mangala, who is valued at around £30m.
United are also monitoring Ander Herrera.
The Athletic Bilbao midfielder was linked with a summer move to Old Trafford, but the Premier League champions failed to make a move.
Could Eliaquim Mangala be a future Manchester United star?
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