Answer
The answer is the UEFA Europa League. Throughout his time at Shakhtar Donetsk, Fonseca led the team to various triumphs, but the UEFA Europa League title eluded his grasp. He guided the Ukrainian club to domestic success, securing multiple Ukrainian Premier League and Ukrainian Cup titles. However, despite his impressive achievements, continental glory in the form of the UEFA Europa League remained elusive during his managerial tenure at Shakhtar Donetsk.