Moyes said: "Jack Rodwell has pulled his hamstring again in training.
"He trained Saturday morning and felt his hamstring again. He had a scan.
"It's a grade one (tear) which is small. We are trying to send him to Germany for treatment.
"Dr Muller-Wohlfahrt is away this week and because he is the Bayern Munich doctor, he has a very big week next week because of their Champions League semi-final.
"So trying to get hold of him will be the hardest thing certainly in the short term.
"I would advise him to concentrate on next season because Jack has probably missed six months with hamstring injuries, so we have to get him working on whatever work programme they recommend him to do."