And, ahead of Saturday's clash with Chelsea at Stamford Bridge, United's manager has echoed those sentiments, insisting that Hazard is the difference when it comes to winning the title.
As Mourinho made his way back to the dressing room after the full-time whistle, he responded to the taunts from Chelsea fans by reminding them of the number of Premier League titles he won in his time as Blues boss.
Ianni forms part of Sarri's 10-man strong backroom staff, along with club legend Gianfranco Zola, one of two assistant first-team coaches.
"Very good results, top of the league and of course lots of good players, but history says that when Eden Hazard is the best player of the Premier League, Chelsea is the champion". We had a good relationship, we were champions together. he was for the first time best player in the Premier League with me, so I think the feelings are good. "We defend mixed, so some players are in zones and some have individual opponents".
Newcastle were, ultimately, unable to capitalise on an early two-goal lead before losing 3-2 but Brighton, Tottenham, Derby and West Ham have all exploited failings - United conceded 11 goals in those four games alone - and Hazard may have every confidence of doing the same. "I don't know his name, I don't need to know".
Both managers claimed afterwards that their teams had controlled the game, with Mourinho describing the draw as an "awful result" for him and his players.
Mega Millions lottery reaches record-breaking numbers
The Powerball jackpot has also climbed to $470 million and people are lining up to buy tickets they hope will make them winners. The federal government takes 25% before the check is handed to the victor , and collects remaining taxes when due.
Ross Barkley's 96th-minute strike salvaged a point for Chelsea after two goals from Anthony Martial had cancelled out Antonio Rudiger's first-half opener and put United on the verge of a first win at Stamford Bridge since October 2012.
Signing in 2015, under Louis van Gaal, Martial's United Premier League career got off to a flying start with the Frenchman a regular in the starting line-up (29 times) scoring 11 goals in the process.
The incident was also skillfully handled by Chelsea's boss Maurizio Sarri, who talked to Mourinho and made Ianni apologize. 'I spoke with my staff and then agreed to speak to Mourinho and say sorry.
"You are talking about one of the best coaches in the world, and I'm not at the moment one of the best". I want to play with short passes.
"Sincerely, I have not seen [what happened], but I have spoken with Jose [Mourinho], then I have spoken with a member of staff because I think we were on the wrong side, so I have dealt with it immediately", he said.
Mourinho eventually returned to his seat and a second fracas kicked off between the players on the pitch at Stamford Bridge.