The Portuguese midfielder suffered an ankle injury that forced him off during the first half of the 1-1 draw against leaders Tranmere a fortnight ago.
Luke Freeman came on as a substitute and will be in line to start if Morais is ruled out.
Darius Charles serves a one-match ban for collecting his fifth yellow card of the season and fellow defender Jon Ashton is still out with an Achilles injury.
With Boro not in action last weekend due to the FA Cup, the first team took on Reading in a friendly in midweek to keep up their fitness and ran out 2-0 winners courtesy of goals from Greg Tansey and Robin Shroot.
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