Here we run through the best WhoScored rated XI for December from Europe's top five leagues comprised of players aged 21 and under. Players qualify for the team if they were 21 or under at the start of December.
No player aged 21 and under in Europe's top five leagues scored or assisted more goals than Paris Saint-Germain wonderkid Kylian Mbappe last month (7).
Sancho impressively scored and assisted in three of his four league appearances in December and completed 14 dribbles in that time. The 19-year-old finished the month with four goals and three assists.
December was another terrific month for Trent Alexander-Arnold, who continues to grow into one of the Premier League's best players. Alexander-Arnold's best display came in Liverpool's 4-0 win at home to Leicester where he played a direct hand in three goals (one goal, two assists).
The full XI:
Goalkeeper: Schubert
Defenders: Alexander-Arnold, Upamecano, Zagadou, Davies
Midfielders: Zaniolo, Rodriguez, Camavinga, Sancho
Forwards: Mbappe, Maja