Mudryk received a huge cheer when his picture appeared on the big screen at Kai Tak Stadium, where Chelsea held an open training session before facing Juventus.
He then warmed up with the wider group as Elton John's iconic hit I'm Still Standing played over the public address system.
He also took part in a number of possession drills with the squad, playfully wrestling with defender Tosin Adarabioyo before one of them.
First, he was part of a group of players likely to be among the substitutes on Wednesday, taking part in a set-piece session led by new coach Austin MacPhee, who has joined from Aston Villa.
He then took part in a second drill led by Alonso as one of two left-sided wingers working on attacking patterns of play.
It is a remarkable turnaround in fortunes for Mudryk, who 36 hours earlier had stepped off a plane from London alongside goalkeepers Mike Penders and Gabriel Slonina, wingers Geovany Quenda and Pedro Neto, and new signing Danny Welbeck, shortly after the announcement of his renewed availability.
Those close to Mudryk and others at the club say he felt genuine excitement and relief about returning to the Chelsea dressing room, where he still knows many of the players.
Mudryk also trained on Monday, and before the training session, Chelsea filmed him pointing to the club badge, perhaps signalling his appreciation for the support he has received from them during his time away.
From the limited videos and pictures released it seems he was fully involved in the drills, and he already looks like a well-integrated member of the squad once again.
Within the restrictions of his suspension, Chelsea kept tabs on him physically and mentally, while several team-mates have stayed in touch and offered encouragement.
Mudryk is understood to be delighted with how he has been treated but much comes down to his efforts during that 20-month spell.
According to those close to him, he has done everything possible to preserve his career, focusing on maintaining consistency and intensity in his time away from Chelsea.
Mudryk hired a private coach and booked goalkeepers and outfield players to train against at Honeycroft Stadium, the home of seventh-tier side Uxbridge FC. His personal coach took him on a training camp to Austria for several weeks this summer, knowing he could be returning to football in the near future.
However, the timing of Mudryk's clearance to play, following discussions between his legal team and the World Anti-Doping Agency (Wada), came as a surprise to the player, his representatives and the club.
Those who have seen him behind the scenes say he has been playing table tennis with team-mates at the squad's hotel, where a number of fans gathered in the hope of getting his autograph.
The question now is whether these training sessions have been enough to impress Alonso and, in time, show that he is capable of returning to the form that once earned him the nickname "the Ukrainian Neymar".

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