Alexander-Arnold has not played since 16 September after a hamstring problem forced him during the champions Real Martia to play on Tuesday.
Liverpool Manager Arne Slot said he had “only positive” memories of working at full-back but did not know which Reds’ support would be taken away from the Reds’ Refs’ Reds supporters.
“I have great memories of the player and the person,” Slott said. “How our fans reacted, I have no idea how it was. He got a warm welcome from me, that’s for sure.”
Alexander-Arnold’s Liverpool Team-Mate Ryan Gravenebrch said he would “give him a hug” because he was “obviously a friend of mine”.
Real Madrid’s Xaron Alonso has said that while he and Alexander-Arnold have not yet spoken about what kind of reception he will get “exactly”, they are speaking “about the club”.
Alonso, who was a key player in Liverpool’s League champions in 2005, added: “He has to have his own feelings and be happy in his own way, so I won’t do it in his own way, so I won’t tell him how he feels.
“Maybe his history is different from mine. He was born and remembers Liverpool, I remember him from a young age in the academy and going to the first league.
“So he has to enjoy that moment because it’s good to come back and for him it’s going to be good.”