[4] On international level, Aşık was a member of the Turkey national team that finished third at the 2002 FIFA World Cup and semi-finalists at UEFA Euro 2008.

He made his debut for the club on 30 August 1992 against Bucaspor, and scored his first professional goal ten days later against Muğlaspor.

He made an instant impact with his new club, scoring the winning goal in the 109th minute of the Chancellor Cup final against Trabzonspor on 11 August 1993.

[4] After winning a Süper Lig title and an UEFA Super Cup with Galatasaray, Aşık signed a three-year contract with rivals Beşiktaş.

[4] In his first season with the club, Aşık earned the nickname "the hero of Stamford Bridge"[7] after putting in a performance to help Beşiktaş defeat Chelsea two to nil on 1 October 2003.

[4] Aşık returned to Galatasaray in February 2006 after making 32 appearances for Beşiktaş in three seasons, signing a one-year contract.

Marred by injuries during his twilight years, Aşık made 24 appearances over his last two seasons before deciding to hang up his boots.

[4] Aşık holds the distinction of being a part of the two most successful Turkey squads: third place at the 2002 FIFA World Cup, and a semi-final finish at UEFA Euro 2008.

[4] Aşık, along with former Galatasaray teammate Okan Buruk, received a farewell match when Turkey faced off against the Czech Republic in a friendly on 22 May 2010.

Having spent a season on loan at Ankaraspor, Aşık was chosen as a reserve defender behind starters Servet Çetin and Gökhan Zan.

[14] After playing the entirety of the match in a two to one goal victory for Turkey, Aşık was benched in favor of Emre Güngör.