Michael Carrick faces time on the sidelines after picking up groin problem
The central midfielder is set to undergo a scan and is unlikely to feature in the Lions' Euro 2016 qualifier with Slovenia on Saturday and friendly with Scotland three days later.
The news only adds to the misery for United boss Louis van Gaal, who is currently without five first-team regulars.
Carrick joins Red Devils defenders Marcos Rojo, Rafael, Phil Jones and Jonny Evans and striker Radamel Falcao on the injury list and could miss out on the clash at Arsenal.
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