In 2002, Trajanov was signed by fellow Bulgarian A Group club Lokomotiv Plovdiv with whom he would win the league in the season of 2003–04.

He made his Bundesliga début on 12 December 2004 as a second-half substitute in a 5–0 defeat to VfL Wolfsburg at Volkswagen Arena.

[5] On 20 February 2017, he reached a historic milestone - Trajanov became the first foreign player to appear in 300 matches in the top Bulgarian division.

Trajanov made his senior debut for Macedonia in a June 2001 FIFA World Cup qualification match against Moldova in Skopje.

On 16 October 2002, Trajanov scored goal during Macedonia's Euro 2004 qualifying match against England at St Mary's Stadium, which finished 2–2.