John Guidetti spent one season on loan at Celtic Park in the 2014/15 season, scoring 17 goals in all competitions.
Despite his impressive performance, Guidetti refused to stay on a permanent basis, citing a simple reason: his lack of game time for Sweden.
"I scored 11 goals immediately, but lost my place in the national team."
Guidetti believed that the stature of the Scottish Premiership was hindering his chances of playing for Sweden, as his teammate Mikael Lustig was being picked while he was left out.
Author's summary: Guidetti left Celtic due to limited national team opportunities.