Well, a pretty good right back is Gokhan Gonul from Fenerbahce. Despite not having best stats, he is worth around 15m $, and is very good for that price.
For CM, I'd try to get Anderson from MU, and maybe Fredy Guarin. They r both pretty fine.
For LWM, well, it's a hard question for me. I love how Miroslav Stoch plays on that position and he's been fine on my saves there(bought him couple times, if i remember right - for sunderland \ tottenham ).
Also, maybe try getting some good players on loan for this positions until next season just to get off this one and save some money?
anyways, good luck mate