Borussia Dortmund remain a threat to United's hopes of signing the midfielder.
But the Evening Standard reports United are pushing to sign Bellingham - and want him to compete for a starting berth right away.
It's claimed they've already communicated this to the teenager - who they consider to be a generational talent behind the scenes.
However, Dortmund are using the example of Jadon Sancho's rapid progress and success to tempt Bellingham to Germany.
Birmingham are seeking at least £35m to sell the youngster.