Ahead of the match, it was confirmed that Willy Kambwala, Sofyan Amrabat and Mason Mount were unavailable due to injury problems, with the trio joining a long list of absentees.
Tyrell Malacia, Anthony Martial, Luke Shaw, Lisandro Martinez, Victor Lindelof, Jonny Evans and Raphael Varane are also on the sidelines for the 20-time English champions.
Rashford was forced off in the final stages of normal time on Sunday, and the England international was videoed by Manchester Evening News journalist Samuel Luckhurst limping through the mixed zone.
According to Luckhurst, McTominay was also «walking gingerly» after the match, with the Scot appearing to suffer a groin problem on his return from a two-match absence.
Man United will now be sweating over the fitness of the duo, with the team having another six league games to play before tackling Manchester City in the FA Cup final at the end of May.
The Red Devils came close to throwing away their spot in the final, as Coventry incredibly netted three times in the latter stages of the match to make it 3-3 and force extra-time.
Penalties were needed to separate the sides after Coventry had what appeared to be a late winner chalked off for offside, and Man United were 4-2 winners in the shootout.
The 20-time English champions face back-to-back home Premier League games with Sheffield United and Burnley to finish the month, and both Rashford and McTominay could be unavailable.
Harry Maguire finishes the match despite apparent injury problemDuring extra-time, Harry Maguire again appeared to be in severe
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