There was still a belief that he could make it at united which is why he was brought back after a good loan spell at Villa and given his chance to challenge for a first team spot, but he wasn't good enough to get into the team ahead of Lindelof. Sending him out on loan again last season wouldn't have made much sense, when else was he going to get his chance, after we have signed Varane? I understand your point about a good loan increasing his value for a sale, but didn't we just get a £5 million loan fee for him? That's significant amount of money.
Pereira has had good games for us in pre season also, I don't think it means a lot. I think the coaches are concerned that he wouldn't be able to handle the physicality of the championship, which is why sending him on loan to a relegation candidate team in spain makes more sense. I mean if he can't get into a la liga team of that level which spanish team will he get into, unless we send him to a lower division spanish team instead.