[1] He is currently working as a youth coach for CSKA Sofia.

Trifonov earned his first call-up to the Bulgaria national side in March 2011 for the Euro 2012 qualifier against Switzerland and the friendly match versus Cyprus, but did not feature in these games.

[2] On 22 February 2018, Trifonov joined Third League club Spartak Pleven.

[4] Missing most of the 2019–20 season due to an injury in the autumn 2019, 35-year old Trifonov decided to retire at the end of the year.

This biographical article related to association football in Bulgaria, about a defender, is a stub.