After emerging through Real Valladolid's youth ranks, he played 16 Segunda División games for the first team in the 2006–07 season as they returned to La Liga after a three-year hiatus.
[1] Subsequently, Asier served two more loan spells in the second division, appearing very little for Deportivo Alavés[2] and Xerez CD (the latter also promoted, but the player only took the pitch on 12 occasions, one match complete).
[3][1] After having featured only once for Valladolid in the first half of the 2009–10 campaign, in a rare start, at RCD Mallorca – but in a 3–0 loss[4][5]– he was finally released in late January 2010, returning to the second tier with CD Numancia by signing until the end of the season and two more.
[6][7] From 2010 onwards, Asier resumed his career in the Segunda División B and Tercera División, with Pontevedra CF, CD Teruel, Sestao River Club, Gimnástica Segoviana CF (two spells), Atlético Astorga FC and CD Palencia Balompié.
[8] He moved abroad at the age of 33, representing teams in Cyprus[9] and Finland and achieving promotion to the Veikkausliiga with Kotkan Työväen Palloilijat.