United's academy player performance manager Les Parry has praised Pellistri for his loan season at Alaves.
“He did well and they loved him," Parry told manutd.com. “He'd have played more but picked up an injury three-quarters of the way through. He got back for the final two or three games and was Man of the Match against Atletico Madrid, who ended up winning the league.
“At the time, he was still 19, may have just touched 19, so he's done tremendously well. At 19 [his birthday was on 20 December], to play in La Liga, hold his own and excel is amazing.
“He is fearless. He's brave and doesn't duck out of tackles. He goes for headers meaning to go for headers – he doesn't just jump. And, when he runs at defenders, one thing you can't let Facundo do is get into the box. When he gets into the box, he has fantastic feet and leaves people standing. As you say, the fans really liked him there.
“The chap there, our link, used to send me all the press cuttings and bits and bobs about him. He did really, really well."