The full-back’s outstanding form during the final month of 2019 was rewarded with the accolade at Melwood on Friday.
A productive December saw Alexander-Arnold chalk up one goal and three assists, as well as helping Liverpool keep four clean sheets as they won each of their five fixtures in the division to maintain a 13-point lead at the summit.
Our No.66 saw off competition from Emiliano Buendia (Norwich City), Dominic Calvert-Lewin (Everton), Kevin De Bruyne (Manchester City), Ben Foster (Watford), Danny Ings (Southampton), Adama Traore (Wolverhampton Wanderers) and Jamie Vardy (Leicester City) to win the prize.
It ensured the trophy remained at Melwood after Sadio Mane won November’s edition of the honour.