The two clubs have been embroiled in negotiations over winger Ivan Perisic, with Manchester United reluctant to meet their minimum asking price of £45m.
Inter, in response, proposed the idea of selling the Croat for a reduced fee with Martial coming the other way on a season-long deal.
And according to Italian media outlet Gazzetta dello Sport, the Serie A side – determined to sign a winger before the window shuts – will now launch a separate bid to sign the Frenchman on a permanent basis after United rejected the prospect of letting him leave on loan.
Gauging what may be going on in Martial’s head is never easy. The youngster wears an unperturbed, almost placid expression most of the time, half disinterested and half suspicious of something, you sense.
But against West Ham you could tell something was different. There was a veneer of cold, ruthless determination to make an impact, and he duly did so with a goal and assist during a fantastic cameo. As he wheeled away after adding United’s third there was a palpable sense of relief mixed with a feeling of vindication.
Above anything, it seems, he wants to show Mourinho that he is capable of maintaining a place in the starting XI this season and will be ready to inflict further damage on Saturday, rather than contemplating a move elsewhere.