You CAN train an injured player only if he has played minutes in that week. Like say, my trainee plays 32 minutes on Thursday and then gets injured. He can be trained on Friday. However if he has not played any minutes in that week I really doubt he can be trained so I think the answer to your question is a no.
H
"Falling in love is not at all the most stupid thing that people do but gravitation cannot be held responsible for it."