Martins scored the winning goal in the 2011 Football League Cup Final as Birmingham beat Arsenal 2–1 at Wembley Stadium, having been brought on as an 83rd-minute substitute. With one minute remaining in normal time, there was a moment of confusion between Arsenal goalkeeper Wojciech Szczęsny and defender Laurent Koscielny as they attempted to deal with a headed knock down from Birmingham's Nikola Žigić. Martins passed the resulting loose ball into the empty net from near the penalty spot. Martins described it as "the easiest goal I've ever scored in my career". After two more Premier League appearances, he spent several weeks out with an injury eventually diagnosed as a stress fracture of the left tibia. After surgery in late April, he faced a recovery period estimated at three to four months.