Adán placed in the top seven at the European Cross Country Championships on three occasions, his best finish of fourth coming in 1994. He shared in the team's silver medals at that competition in 1994 and 2000, before claiming the team title alongside Antonio David Jiménez at the 2001 European Cross Country Championships. At the 1994 European Athletics Championships, his sole outing at that event, he placed sixth in the 5000 metres.