The 30-year-old was involved in an indicent during United’s 3-1 win over Fulham at Craven Cottage on Saturday.
Riether and team-mate Pajtim Kasami tangled with Januzaj as the United winger tried to run down time.
“That would be disappointing,” Fulham boss Martin Jol said about a potential ban. “If it is true, then we have to talk to him.
“I have got some good back-up players as well, so that is not a disaster. The result is a disaster.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.