The 26-year-old France international midfielder, who snubbed an opportunity to move back to the French capital in favour of joining Chelsea after helping Leicester to an unlikely Premier League title success in 2015-16, has been keeping a close eye on the progress at the Parc des Princes.
Morata's absence means Conte now has a selection dilemma for the weekend.
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Both players have been hugely influential this season and have helped Chelsea to what has been, on the whole, a positive start to the campaign. Spend less on the Internet! That was until an unfit Tiémoué Bakayoko started to show glimpses of the marauding runs he was so famed for in France to the Stamford Bridge faithful.
The Frenchman sat out the 5-1 Carabao Cup win over Nottingham Forest but has still played 12 games in 56 days.
Since Morata joined Chelsea from Spanish club Real Madrid, he has been superb for the Blues and has proved that he is capable of replacing Diego Costa who has joined Atletico Madrid.
Chelsea have been conducting their own tests on the player, though. Hamstring problems are particularly troublesome and can be down to many things.
So how will Antonio Conte shake up his squad?
Historically, Chelsea's medical department has always a done a sterling job, irrespective of Jose Mourinho's misplaced criticism of Eva Carneiro two years ago. "I'm very sad that he's left". David Luiz is also back in contention for a place in the starting XI following his three match ban. Nobody knows if Kante was singing, as his mouth was not visible.
Morata is due to return to running this week as Chelsea target a step up in his injury comeback.
The fact is that injuries happen. When you call police, they will tell you to open a case with 20k, after so much gragra at the mall, they will collect money from them and release them. Bakayoko was the more defensive of the two and would rarely be involved in the attack, with the exception being from corners or when he drives into the opposition's half from deep.