When Fellaini played in front of the defenders the past few seasons we didn't concede as many as we have this season which does show how much we need that powerful midfielder who can just sit in front of the defence and break up the play and also if needed can go forward. Havnt seen too much of this lad but by the sounds of it this lad can do this job and lets face it, 3 mil now and 3 mil in the summer for a lad who had 28 million bid rejected last season and is still 22, with Moyes managing this lad we can't really go too wrong.
Also adding to what was mentioned about Heitinga, I wouldn't want to sell him as mentioned, with only 2 experienced CB's one injury and we could be in trouble. I believe there is some money left even if minimal but even if we throw Gueye in the deal or just sell him we can have enough.