Career
Youth career
Born in Klyuch, part of Petrich municipality, Blagoevgrad Province, Delev started to play football in Pirin. During the season 2007-2008 he played for the team in the Bulgarian amateur division. Pirin took first place and were promoted to the "B" professional football group.
On 9 August 2008 Delev made his debut in professional football in a match against Botev Krivodol.
In this match he scored his first goal in B PFG. In the first half of 2008-2009 season Delev scored 8 goals in 16 matches. New Pirin
After the union of the two Pirin clubs from Blagoevgrad in December 2008, Delev joined the part of the team, which plays in the top division.
On 4 March 2009, he scored a goal in a match against CSKA Sofia for the Bulgarian Cup and Pirin eliminated their opponent. In the semi-final of that tournament against Levski, Delev had a tragic accident.
Аfter spasm of the lungs he remained to lie on the grass, and later was sent to emergency hospital.
lieutenant was later found out that he had played with a flu. Delev made his A PFG debut on 8 March, in a match against Cherno More. On 5 April, he scored twice against Belasitsa Petrich.
Those were his first goals in A PFG. On 11 June, Delev was named the Best Young Football player of the 2008-2009 season in Bulgaria.
Just 19, Delev"s goals helped Pirin to reach the Bulgarian Cup final. CSKA Sofia
After seven months without a club, Delev returned to CSKA Sofia on 31 January 2013.
Mersin Idmanyurdu
On 12 January 2012, Delev signed a 3,5-year contract with Turkish side Mersin İdmanyurdu. Delev"s debut came on 15 January, in a 0–2 home loss against Antalyaspor in a Süper Lig match, during which he appeared as a second-half substitute.
On 24 January, Delev netted his first goal for the team, opening the scoring in a 1–2 home loss against Kayserispor.
In June 2012, he dissolved his contract due to financial reasons. Las Palmas
On 30 July 2013, Delev completed his move to Las Palmas on a free transfer. He signed a two-year contract and was given the number 22 shirt.
In October 2008, the Bulgarian under-21"s manager Ivan Kolev called Delev into the Bulgaria U21 team for the friendly matches with Greece and Macedonia.
He made his debut for the senior side on 26 March 2011, in the Union of European Football Associations Euro 2012 qualifying match against Switzerland. On 4 June 2011, he came on as a substitute in the qualifier against Montenegro.