Raúl started out in the youth ranks of Grupo Astur, and went on to represent two of the giants of the Asobal league. He made his professional debut in 2001 for Ademar León, where he played for six seasons and won a Copa del Rey (2001/02) and a Cup Winners Cup (2004/05). In June 2007 he switched to Valladolid, where he played for three seasons and won yet another Cup Winners Cup. In the 2010/11 season, Entrerríos signed for FC Barcelona, where his older brother Alberto already had played in the season 2001/02.
Since arriving at the Club, he has won everything possible, both domestically and in Europe and has converted himself into an indispensable part of the set up at Barça.
He has played more than 200 times for the Spanish national side and has won various medals in international competition.
Entrerríos is a team player, a natural leader and highly versatile. He usually plays as a centre back but can play anywhere on the first line if called upon. He is strong in the one on one and connects well with the central playmaker. He combines solidity in defence and attack and is noted for being a very hard worker that always fights until the end.