|Full name||Ismail Isa Mustafa|
|Date of birth||26 June 1989|
|Place of birth||Targovishte, Bulgaria|
|Height||1.83 m (6 ft 0 in)|
|2008–2009||→ Sliven (loan)||17||(1)|
|2009–2010||→ Lokomotiv Mezdra (loan)||25||(11)|
|2012||→ Elazığspor (loan)||6||(2)|
* Senior club appearances and goals counted for the domestic league only and correct as of 1 May 2018|
Ismail Isa made his unofficial debut for Levski in a friendly match against Dynamo Kyiv on 20 January 2008. He played for 33 minutes. The result was a 1–2 loss for Levski. On 20 February, he scored his first goals in a friendly against Vidima-Rakovski Sevlievo. He scored two goals in the 75th and 85th minute. The result of the match was a 3–0 win for Levski. He made his official debut in a 1–0 defeat away to Lokomotiv Plovdiv.
During the 2008–09 season, he was loaned to OFC Sliven 2000. Anyway, after the end of the season, he returned to Levski.
Isa re-debuted for Levski on 15 July 2009 in the 2nd Qualifying round of UEFA Champions League, where Levski defeated the team of UE Sant Julià. The result of the match was 4–0 with a home win for Levski. On 21 July, he was sent off at the stroke of half time for a second bookable offense in the return leg against the Andorran side, but despite playing a man down his team won 5–0. His return was in a match against Dundalk – a second qualifying round of Europa League. Levski won the first match and the result was 6:0. Isa scored two of the goals. He further added to his tally in the 5–2 home win against the Swedish Kalmar FF, where he scored another two goals.
Lokomotiv Mezdra (loan)
On 2 August 2009, Ismail Isa was loaned for half a season in Lokomotiv Mezdra. After matches, in which he scored 7 goals in 12 matches, Isa returned to Levski. Shortly afterwards on 11 January 2010, though, he was loaned out to Lokomotiv Mezdra again. On 21 March 2010, he scored the only goal for his side to give the team from Mezdra a 1:0 lead against the other Bulgarian top team CSKA Sofia. This goal got him in the news since just a few minutes after it the CSKA supporters flooded the field and stopped the match, earning their team a 3–0 disciplinary loss (4:0 aggregate loss). After scoring 11 goals in 25 caps Isa was brought back to Levski on 24 May.
In June 2011, Isa joined Turkish Super League club Karabükspor. Media reports estimated the transfer fee to be around €200,000. On 22 October 2011, Isa made his official debut for his new team, playing the first 85 minutes and earning himself a yellow card in the 2:0 home win over Istanbul B.B. in a Turkish Süper Lig match.
Isa was signed by Litex Lovech for the 2012/2013 season and netted 7 goals in 11 appearances during the first half of the season. He finished the 2012/2013 A PFG season as the fifth highest goal scorer in the league, having managed 11 goals.
In June 2013, Isa signed a contract with Moldovan club Sheriff Tiraspol. He marked his debut by scoring a goal in the 2:0 win over FC Tiraspol in a Moldovan Super Cup match that was held on 29 June.
Isa was a part of the Bulgaria national under-19 football team. During his time with the team he played in the 2008 UEFA European Under-19 Football Championship in the Czech Republic. On 29 April of that year he scored a goal in qualifying match against Norway. On 7 February 2015, Isa made his first appearance for Bulgaria, in the 0:0 draw with Romania in a non-official friendly match, playing over the course of the first 70 minutes.
- As of 30 April 2018
|Sliven 2000 (loan)||2008–09||17||1||2||0||0||0||-||-||19||1|
|Lokomotiv Mezdra (loan)||25||10||1||0||0||0||-||-||26||10|
|Beroe Stara Zagora||2015–16||25||7||5||2||0||0||0||0||30||9|
|Vereya Stara Zagora||2017–18||7||2||0||0||0||0||0||0||7||2|
FC Sheriff Tiraspol
- "Профил на Исмаил Иса Мустафа" (in Bulgarian). fpleague.bg. Retrieved 22 June 2018.
- "Светкавица иска пари от трансфера на Иса" (in Bulgarian). topsport.bg. 30 June 2011.
- Domuschiev, Angel (22 March 2010). "ЦСКА се хвърли от трибуната в Мездра, фенове на червените нахлуха на терена с камъни, мачът прекратен в 65-ата минута". 7sport.net. Retrieved 7 July 2015.
- "Хасково прибира 8 бона от Иса" (in Bulgarian). 7sport.net. 28 June 2011. Archived from the original on 4 March 2016.
- "Karabükspor-İstanbul BB 2:0". soccerway.com. Retrieved 25 October 2011.
- "Sheriff signs Ismail Isa". fc-sheriff.com. 12 June 2013.
- "Берое" подписа с нов централен нападател" (in Bulgarian). sportal.bg. 14 September 2015. Retrieved 9 May 2016.
- "ПФК Верея подписа с Исмаил Иса" (in Bulgarian). fcvereya.bg. 19 October 2017.
- "Romania vs. Bulgaria 0:0". flashscore.com. 7 February 2015. Retrieved 7 February 2015.
- "Картотекират Исмаил Иса като турчин". sport1.bg. Archived from the original on 1 October 2011. Retrieved 29 June 2011.