Stiliyan Alyoshev Petrov (Bulgarian: Стилиян Альошев Петров, born 5 July 1979) is a former Bulgarian professional footballer who played as a midfielder. Petrov joined Celtic from CSKA Sofia in 1999, and won ten trophies in his time at Celtic Park, including four Scottish Premier League titles. In 2006, he moved to Aston Villa in the Premier League, along with his former manager Martin O'Neill. Petrov became club captain at Villa Park, and was an inductee to the Aston Villa Hall of Fame in 2013. In addition he is Bulgaria's all-time most-capped player with 105 appearances for the side.
In March 2012, Petrov was diagnosed with acute leukaemia, suspending his football career to have treatment which was ultimately successful. He announced his retirement from the game in May 2013, but began searching for a new team three years later. During the summer of 2016, Petrov trained with former club Aston Villa. He played during pre-season matches but was not offered a playing contract by manager Roberto Di Matteo.