Date of birth: 15 May 1970
Nationality: Dutch
Playing career: AFC Ajax, FC Barcelona, Galatasaray AŞ, Rangers FC, Al Rayyan SC, Al-Shamal SC
Coaching career: AFC Ajax (youth), Netherlands (assistant), Ajax

• Started out as a left-back but matured into a dominant centre-half at Ajax, where he came through the ranks along with his twin Ronald. Broke into the first team aged 18, winning the first of five Eredivisie titles in 1990.

• Part of the team that lifted the 1992 UEFA Cup, he helped Ajax beat AC Milan in the UEFA Champions League final in Vienna three years later, adding the UEFA Super Cup and European/South American Cup later that year. Won the domestic double in 1997/98, his last full season with Ajax before moving to Barcelona with Ronald. A Liga title followed in 1999 and De Boer made over 150 appearances for the Catalan giants.

• Moved to Galatasaray in summer 2003, signing for Rangers the following January. Hung up his boots in 2006 after a spell in Qatar, ending a career that brought 112 caps for the Netherlands. De Boer was in the Oranje side that reached the 1998 FIFA World Cup and UEFA EURO 2000 semi-finals, missing two penalties in a defeat by Italy in the latter.

• Returned to Ajax as a youth coach in 2007 and the following year was appointed assistant to Bert van Marwijk with the senior national side, who reached the 2010 World Cup final.

• In December 2010 he was installed as Ajax's caretaker coach following the departure of Martin Jol, good results subsequently earning him a three-and-a-half year deal as his first season in charge ended with the club's first league title since 2004. Helped the Amsterdam side retain the Eredivisie crown the following campaign.