However, while his five-game ban remains, two matches instead of one have been suspended for three years.
The Portuguese served one game of his ban last season which means he will miss two matches in this season's tournament. A $71,000 (£43,000) fine was also upheld.
The former Chelsea coach had suggested that referees were biased towards the Catalan club, making it impossible for his side to win.
"After hearing the parties and looking at various pieces of evidence, the appeals body decided to modify the sanction," UEFA said in a statement.