He said, “I don't think Koeman let me down, in the end there are players ahead of you and you have to be brave. I could have stayed at Barca but I needed minutes and (Jose) Bordalas put his confidence in me from the start.
“Bordalas only told me to play how I know, I have to work harder in defence. The confidence the coach put in me was what I needed for me to come here. I'm very grateful."
Alena is now reunited with his former Barca B team-mate Marc Cucurella.
“Cucurella spoke well of the club to me, I trust him a lot and I'm very happy," added Alena. “I want to feel like a player again, get the protagonism that I need. I'm in good shape."