Rafinha cant play as a RWB about only reason to keep him would be as back up RW where even then he is nothing great.
Would guess more options in wide areas is something they want to address so wont need him for that either in that case.
Alena getting minutes ahead of Rafinha in midfield next season from B team or not still one less body in the way of a player that has proved in past few seasons not quite good enough.
Rafinha was our starting RWB in 3-4-3
tbh I want us to retain most of our players and be patience with many of our players unless they are dead weight (Arda,Mathieu,Gomes)
RM has been patient with many of their players and it lead to this enormous depth they have, on the other hand having 6 new bench players did us a lot of bad in the 1st half of the season (we kost 16 points in 1st 17 weeks and 8 in the 19 games afterwards IIRC) and big part of it is our bench
Rafinha is currently one of our best bench players, I don't see a reason for selling him to open place for anyone. If Alena is good let him force himself into the squad by being too good to ignore.