Both players were missing from the matchday squad, after failing late fitness tests.
Providing an early update on the pair, U’s head coach Des Buckingham said: “They both failed fitness tests in the afternoon, and that’s as much as I know at the minute.
“That was training on Thursday afternoon, when Josh McEachran had a niggle. He made a pass and felt something, and Marcus was the same right at the end of the session in the last five minutes.”
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McEachran stepped in well for the two previous games, against Peterborough United and Lincoln City, when Cameron Brannagan was forced to miss out due to an ankle problem.
Buckingham said: “Josh fits the system extremely well, and to have two players with Josh and Cam, it’s good to have both.
“It would’ve been nice to have Josh because I think his range of passing would’ve unpicked a very resolute defence, but it wasn’t to be, so we kept Cam there.”