On the following day he made his unofficial debut in a friendly against Metalist Kharkiv,[2] before signing a two-year contract on 2 July as a free agent.

Mulder made his last appearance for Levski Sofia on 24 May 2014, after replacing Elin Topuzakov in the first half of a 3–2 win over Lazio in an exhibition match, which was held in commemoration of 100 years since the founding of the "blues".

[7] In the beginning of June 2014 new appointed sports director of Levski announced that the "bluemen" would no longer use Dustley's services as player.

In July 2014, Mulder signed a one-year contract with Cypriot club Apollon Limassol, with an option for an additional year.

[8] He made his official debut on 21 August 2014, in the 1–1 home draw with Lokomotiv Moscow in a UEFA Europa League match after coming on as a substitute during the second half.

[10] Mulder made his debut for the Curaçaoa national team in a qualification match for the 2018 World Cup against Montserrat on 28 March 2015.