The Dutch defender was one of Sir Alex Ferguson's last signings when arriving from Vitesse Arnhem in August, 2012. A dependable understudy for Patrice Evra at left-back, he scored on his debut against Wigan Athletic and also netted in Sir Alex's final game as manager at West Brom.
Although continuing to play second fiddle to the experienced Evra under David Moyes, Büttner was outstanding against Bayern Munich in the Champions League when the Frenchman was suspended, marking his fellow countryman Arjen Robben superbly.
Overall, Büttner made a total of 28 appearances for the club, 25 as a starter, with his final outing coming in the 3-1 defeat of Hull City at Old Trafford in May.
Everybody at Old Trafford would like to thank Alex for his service and wish him well for his new career in Russia.