The 34-year-old is a free agent after leaving Paris St-Germain and United are set to hand him a one-year, £250,000-a-week contract.
The Swedish superstar was seen as an ideal candidate to join the Olympic Stadium-bound Hammers but the free signing now looks a strong favourite to join the Mourinho OT regime.
The pair know each other well and sources strongly tip a year’s contract for the 34 year old under his former boss who also has to look at the situation involving Reece Oxford.
It has been strongly reported that United were plotting a £10 million move under sacked Louis van Gaal although Hammers insiders claim he is going nowhere.
However Mourinho will be looking at any proposed business on the United agenda and take a view so nothing can be ruled out at this stage.