Ajax Blind began his career in the youth academy of his hometown club,
Ajax; the same club where his father
Danny made his name as a professional. Blind is a product of the
Ajax youth system and, while officially still a B-junior, he became a mainstay in the A-juniors during the 2007–08 season He showed good promise as a youngster and was made captain of
Jong Ajax in 2007. He signed his first professional contract at the age of 17, tying him to the club until 1 July 2010. On 7 December 2008, Blind made his debut in the Ajax first-team in the away match against
FC Volendam. Blind made an immediate impact when he forced a corner kick through a Volendam defender, from which
Jan Vertonghen scored the winning goal for Ajax.
Loan to Groningen On 5 January 2010, he joined
Groningen on loan for the remainder of the 2009–10 season, during the winter transfer window. At Groningen, Blind was mainly used as a
right back. He was almost sold to Groningen for €1.5 million by Ajax on a permanent basis but the move did not materialize. On 23 April 2013, it was announced by
Marc Overmars that Ajax and Blind had reached an agreement to extend his contract for three years, binding him to the club until the summer of 2016. On 5 May, Blind contributed to Ajax's third Dutch
Eredivisie title in a row, marking the club's 32nd national title, helping to defeat
Willem II 5–0 at home, and securing the top position on the table just one match day from season's end. Later that day it was announced that Blind had been declared AFC Ajax Player of the Year for the
2012–13 season, after playing an outstanding fifth year for Ajax, from the starting left-back position. During the
2013–14 season, De Boer moved Blind back to his natural defensive central midfielder position and was named
Dutch Footballer of the Year as Ajax won a fourth consecutive league title.
Manchester United On 30 August 2014,
Manchester United reached an agreement to sign Blind, subject to a medical and agreement of personal terms. The transfer was completed on 1 September 2014, for a fee of £13.8 million. Blind made his debut 13 days after his signing, playing the full 90 minutes as United beat
Queens Park Rangers 4–0 at
Old Trafford for their first victory of the season. His first goal for the club came on 20 October, a 20-yard strike that earned United a 2–2 draw at
West Bromwich Albion. On 16 November, Blind sustained a knee ligament injury in the
Netherlands'
UEFA Euro 2016 qualifier against
Latvia which kept him out of the Manchester United team for the remainder of 2014. On 11 January 2015, Blind returned to the United team, starting in defence in a 1–0 loss to
Southampton at Old Trafford. On 8 February, he scored an injury-time equaliser for United in a 1–1 draw against
West Ham. Although throughout the previous season Blind was used as a defensive midfielder or left back, Blind started the season as a centre back, where he played for the majority of the season. On 12 September 2015, he scored his first goal of the season in a 3–1 win against
Liverpool at
Old Trafford, also being named man of the match for his performance. He began the
2016–17 Premier League season as first-choice centre back alongside
Chris Smalling; however, he lost his place in the team following a return to form of
Phil Jones and
Marcos Rojo. He worked his way back to the first-team, but featured mostly at left back, replacing first-choice left-back
Luke Shaw. He scored his first goal of the season against Sunderland on Boxing Day, charging into the box to connect with a pass from
Zlatan Ibrahimović and finishing low into the bottom corner. He started the Europa League final against his former team Ajax, which Manchester United won 2–0.
Return to Ajax On 17 July 2018, both Manchester United and Ajax announced they had agreed a transfer for Blind to return to Ajax for a four-year deal and a fee of €16 million with conditional add-ons. On 16 December 2018, Blind scored his first senior
hat-trick, in an 8–0 league win over
De Graafschap at home, whilst playing as a centre back. In August 2020, Blind collapsed during a pre-season friendly and was due for medical exams before returning to training. On 27 December 2022, Blind and Ajax mutually terminated his contract and Blind left the club as a free agent.
Bayern Munich On 5 January 2023, Blind joined
Bundesliga club
Bayern Munich on a contract until the end of the season.
Girona On 7 July 2023, Blind joined
La Liga club
Girona on a two-year contract. On 12 August 2023, he made his debut for the club in a 1–1 draw against
Real Sociedad. On 3 January 2024, Blind scored his first goal for Girona in a 4–3 win over
Atlético Madrid. It was the club's first ever league victory over Atlético and the result ensured that Girona would be equal on points with
Real Madrid at the top of the table at the halfway point of the
La Liga season. On 15 May 2024, Girona announced that Blind had signed received a one-year contract extension, keeping him with the club until June 2026. ==International career==