El Submarino Amarillo drew Italian heavyweights Internazionale in the quarter-finals of the Champions League. The first leg was played at the San Siro on 29 March 2006. Playing at the San Siro, Diego Forlán scored inside the first minute of the match, but Villarreal lost 2–1 as Inter took a lead to the return leg at Estadio El Madrigal on 4 April. Villarreal, however, continued their unbeaten home record in the Champions League as they beat the Italian giants 1–0 in the second leg to qualify for the semi-finals on the away goals rule (the tie ended 2–2 on aggregate, but because of Forlán's goal in Milan, Villarreal advanced). During that game, left-back Rodolfo Arruabarrena turned a back header from Juan Román Riquelme free kick past Inter's goalkeeper Francesco Toldo to score the decisive goal of the tie. In the semi-finals, Villarreal narrowly lost out to Arsenal on a 1–0 aggregate scoreline following Arsenal's goalkeeper Jens Lehmann's save of Juan Román Riquelme's last-minute penalty. Villarreal signed Robert Pirès from Arsenal in the summer following their Champions League semi-final defeat. He is playing for the team now after a long injury lay-off. The 2006–07 season started very badly but Villarreal were able to qualify for the UEFA Cup after eight consecutive wins. "The Yellow Submarines" were 13th after Round 30 of La Liga, but they climbed to finish fifth at the end of the season.