The Portuguese boss was sacked in December 2015 by the Blues just seven months after he lifted the Premier League trophy.
As a result of their failings in the first half of the season under Mourinho, Chelsea managed just a 10th-place finish.
But Antonio Conte has benefited from the lack of European football at Stamford Bridge.
His Chelsea stars have been able to recover and put full attention towards regaining the title from Leicester.
Antonio Conte and Jose Mourinho clashed in Chelsea's 4-0 win over Manchester United in October
Jose Mourinho has repeatedly complained about his side’s hectic schedule
While the Blues hold a 10-point lead in top spot, Manchester United manager Jose Mourinho has repeatedly complained about his side’s hectic schedule.
The combination of EFL Cup, FA Cup, Europa League and Premier League games has stretched United to the limit.
And with the Red Devils travelling to rivals Chelsea on Monday night (7.45pm) for their FA Cup quarter-final tie, United’s fitness will again be tested.
Jose Mourinho has been left frustrated at Manchester United's constant busy schedule this term
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Conte’s men have a seven-day break prior to the clash, while United play in Russia tonight (6pm) against FC Rostov, which has seen Mourinho hit out at the easy schedules of rivals at the top of the Premier League.
The ex-Blues boss has also accused his former team of being defensive, but Conte has refrained from biting back at the various jibes.
October’s 4-0 win at the Bridge over United caused further tension between the managers as Mourinho said the Italian’s behaviour was humiliating.
But Conte has continued to restrain himself throughout the season, and The Telegraph has revealed how.
Antonio Conte's enjoyed great success in his first season at Chelsea with a title on the cards
It is said the array of comments from Mourinho have prompted smiles from those inside Chelsea.
Those at the club feel it is ironic from Mourinho and point to the fact Chelsea’s fixture list is so light due to his disastrous leadership last term.
Conte has managed to build the team back up to title contenders, while Mourinho’s Manchester United sit in sixth.
With Mourinho’s second return to west London around the corner, Conte is determined to cause more pain by naming his strongest team next week.