Rooney back in training ahead of Bayern trip
The England forward suffered a toe injury during the first leg of his side's quarter-final against Bayern, which ended in a 1-1 draw at Old Trafford last week.
Rooney subsequently missed a 4-0 victory over Newcastle United in the Premier League last weekend, but has a chance of featuring in Wednesday's match at the Allianz Arena.
United confirmed on their official Twitter page that Rooney - together with fellow injury victims Patrice Evra, Jonny Evans and Ashley Young - had taken part in training on Tuesday.
"Wayne Rooney, Ashley Young, Patrice Evra and Jonny Evans are all training this morning ahead of our trip to Germany," read a tweet.
Young suffered a hand injury in the win over Newcastle, while Evra was replaced just after the hour due to a knee problem.
Evans (calf) has not featured for United since their away defeat to Stoke in early February.