Juventus goalkeeper Wojciech Szczesny was seen struggling to breathe during their Europa League quarter-final first leg against Sporting Lisbon and left the pitch in tears, but later revealed he was okay.
The Poland international needed medical attention in the 42nd minute when he repeatedly touched his chest before speaking to his team-mate Gleison Bremer.
Bremer then requested that Juventus' medical staff entered the pitch.
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After a three-minute delay, the former Arsenal goalkeeper informed head coach Massimiliano Allegri that he could not continue playing and he was substituted for Mattia Perin. Szczesny was in tears as he left the pitch.
Sporting Lisbon tweeted "Forca, Szczesny" after the incident before Juventus confirmed on their own social media that he is "doing well".
The tweet said: "After an initial check, Tek is doing well"
It is expected that Szczesny will undergo further medical examinations to understand the nature of the problem.
After the game, Szczesny told Sky Italy: "I'm fine, a little anxious but I just checked and everything is fine.
"What happened? Fear, something that had never happened to me, I was struggling even to breathe, a little anxiety and fear, but now I'm much better."
Szczesny has made 29 appearances for Juventus this season. An Arsenal academy graduate, Szczesny spent eight years with The Gunners before spending two years on loan at Roma in 2015.
The 32-year-old joined Juve permanently in 2017 and has made 206 appearances for the Serie A club.
Juventus won the first leg 1-0 thanks to a Federico Gatti strike from close range in the 73rd minute.
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