Buttner spent just two years at United after joining the club in 2012, making just 28 appearances.
The left-back is often remember as one of the most unworthy recipients of a Premier League winner’s medal however, after he played five games in the 2012/13 league campaign.
But the 27-year-old, who recently joined Eredivisie club Vitesse, insists his time was a success, and that even Gerrard cannot match his achievements.
“My adventure with Manchester United was not a failure,” Buttner told Algemeen Dagblad.
“Who can say that they have won the Premier League title? I can say that.
“Even Steven Gerrard hasn’t managed it.
“I played more games for United than I ever dreamed of.
“I’ve become a much better football player, I played in the quarter-finals of the Champions League against Bayern Munich and Arjen Robben.”