[2] Having failed to make an appearance for the first team, Darko was loaned out to League Two side AFC Wimbledon on 21 February 2013 on an initial one-month deal.

[3] Reunited with former teammates Jonathan Meades and Kevin Sainte-Luce, the trio developed at the South Wales club under the guidance of Neal Ardley.

[4] On 23 February 2013, Darko made his professional debut for AFC Wimbledon in a 1–0 win over Dagenham & Redbridge, coming on as a second-half substitute for Gary Alexander.

With his side finishing as champions of the Southern Counties East League and earning promotion to the Isthmian Division One South, he managed just eight appearances during the season.

[13] On 29 August 2015, while playing in an FA Cup match at Beckenham Town, Darko collided with the opposing goalkeeper and suffered a broken fibula.