With fixture congestion reaching a level difficult to manage, the casualty list grows with every passing game.
Solskjaer has already confirmed the continued absence of star players Paul Pogba, Donny van de Beek and Juan Mata who will all miss the action through their respective injury woes.
While Diallo grabbed an impressive first goal for United after coming on, the injury to Martial has thrown his chances of making Sunday’s squad into doubt.
It remains unclear whether David De Gea will be available as Solskjaer confirmed his return to Manchester this week following the birth of his child.
On a brighter note, Scott McTominay’s return to fitness has come at the ideal time for Solskjaer, with the Scottish international managing his comeback well.
The United academy product has invigorated an already in form West Ham side, powering them to within touching distance of the top four with his six goal involvements in as many games, having recently been nominated for the Premier League Player of the Month award.
Elsewhere, Angelo Ogbonna, who had a very impressive start to the season, remains out while Ryan Fredricks, Arthur Masuaku and Andriy Yarmolenko remain big doubts to travel to Manchester.
Manchester United: Henderson, Wan Bissaka, Bailly, Maguire, Shaw, Fred, McTominay, James, Fernandes, Diallo, Greenwood
West Ham United: Fabianski, Dawson, Diop, Cresswell, Coufal, Soucek, Rice, Johnson, Bowen, Antonio, Fornals