Which fellow Netherlands international did Frank Rijkaard sign for FC Barcelona in 2005?
2005–06 FC Barcelona season:  It was manager Frank Rijkaard's third season in charge of the club, a season in which he managed to successfully retain the La Liga title, as well as winning the UEFA Champions League and Spanish Super Cup. 2005–06 FC Barcelona season:  The squad was largely unchanged from the previous season, with only two players – Santiago Ezquerro and Mark van Bommel – joining the club. Mark van Bommel: Mark Peter Gertruda Andreas van Bommel (] ; born 22 April 1977) is a Dutch former professional footballer.
Mark van Bommel