- Celebrated Portuguese manager Jose Mourinho has opened up on the opponent that made him 'suffer' the most throughout his coaching career
- Surprisingly, it was Martin O'Neill's Celtic side that gave the Roma boss the most stress during his managerial career
- Since then, the 59-year-old trainer has won a plethora of titles with Chelsea, Inter Milan, Real Madrid, Manchester United and most recently AS Roma
Iconic Portuguese tactician Jose Mourinho has named Scottish giants Celtic as the team to have given him the most stress throughout his illustrious coaching career.
Mourinho revealed Martin O'Neil's 2003 Celtic side as the most formidable team he has ever faced in a career which has seen him annex a staggering 26 major trophies.
During his fledgling years as a manager, Mourinho inspired Porto to the finals of the 2003 UEFA Cup against Celtic - which ended in favour of the now AS Roma boss and his charges after extra-time.
Recalling the encounter, the 59-year-old reckoned that among all the games he has played, Martin O'Neil's Celtic gave him the most challenging contest.
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"That final against Celtic was not the biggest win, it was not the greatest joy, but in terms of intensity it was my biggest ever game," Mourinho said, as per the Daily Record as quoted by SportBIBLE.
"The game ended and I thought 'the game is over and I am dead. It's still the tensest game in my career.
"I've played three European finals since, two in the Champions League. I've won many titles and been involved in many incredible games.
"But in terms of living with tension, intensity, with emotion raised to the limit, that game against Celtic beat them all."
Jose Mourinho wins Serie A coach of the month for August
The 59-year-old manager inspired the Rome-based outfit to three wins and a draw in the August fixtures - scoring on six occasions while shipping in only one goal in the process.
Mourinho will receive his well-deserved accolade during the pre-match of Roma vs Atalanta, scheduled for Sunday, September 18 at 6.00 pm at the Stadio Olimpico.