Redknapp wasn't all criticism though, as the high profile former midfielder added: "Mkhitaryan is the only player Chelsea found it hard to keep a lid on but he would not play in Sarri's side ahead of Hazard".
"We could see today that fans love me".
But he was given a hero's welcome when he was introduced on the hour mark at Stamford Bridge on Saturday and set up the victor in a thrilling five-goal encounter for Marcos Alonso as Chelsea went top of the embryonic Premier League table.
How quickly Sarri can mould his defenders, who have been used to playing in a back five, into an effective back four may ultimately decide whether or not Chelsea can challenge for silverware. Stereotypes matter little. If a player has quality, they can make the grade anywhere.
Morata is enthused by the success Sarri had with the likes of Gonzalo Higuaín, Dries Mertens and Lorenzo Insigne at Napoli and feels confident that under the 59-year-old's guidance he too can become a consistently potent centre-forward.
And two games into the Premier League season only champions Manchester City have scored more goals than Chelsea, who rank first in the division for completed passes, second for key passes and third for total shots per game.
Morata also seems keen to lay down roots, having regularly been on the move during a career that has also taken in a spell at Juventus.
If Sarri wanted to persuade Kovacic to stay on a permanent basis, he is off to a good start.
"Leaving this year? I will not leave", he told French radio station RMC. We start to work altogether two weeks ago so now my target is to play 90 minutes like the first 25.
Jorginho is set to start for Chelsea once again when they face Newcastle United next weekend.
The Switzerland global retained his starting spot in the Arsenal team despite their 2-0 loss to defending Premier League champions Manchester City in their season opener. But I'm happy here. "We lost distances, we were not able to press. We were really in trouble".
The Fiver: sign up and get our daily football email.