Retired Argentine striker Sergio Aguero does not believe he will be able to run again, and now fears his heart is "not working properly" after he was forced to retire from football.
And the former Argentine international put an end to his football career at the age of 33 in an emotional press conference last December due to a heart disease.
The former Manchester City striker suffered from chest pains and breathing problems during the first half of Barcelona's 1-1 draw at home with Alaves on October 30.
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Despite the video that spread of him playing tennis last January, he gave fans a terrifying development of his condition and expressed his concern that his heart was "not working properly".
Speaking about his health, Aguero said, "If I try to play football now, I can't catch my breath."
"Sometimes I wonder if I will be able to run again. I just feel my heart is not working properly," he continued.
Aguero rose to prominence on the European stage when he joined Atletico Madrid in 2006 before signing with City in 2011.
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He emerged in his first season at the "Al Ittihad" stadium when he scored the winning goal for his team in stoppage time against "Queens Park Rangers" and gave the "Citizens" the first English Premier League title since 1968.
And he revealed earlier in February that he knew his heart problem was serious when he was "left in a small room alone with monitoring equipment", while doctors conducted tests on him in hospital last year.
"I had a hard time in the first 15 days," he said. "When it happened, I thought it was nothing and that I would be fine, but when I got to the hospital they left me in a small room alone with a lot of screens around me... I realized something was wrong. Two days later. From entering the hospital, I started to feel nervous."
The Argentine national team striker - who scored 426 goals and assisted 118 other goals in 786 games he played in his career - joined Barcelona on a free transfer from Manchester City last July, but a calf injury delayed his start with the team. Catalan until last October.
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Aguero participated in 5 matches with Barcelona in all competitions, and played 166 minutes, and his only goal came in the team's shirt in the Clasico match that Real Madrid lost 1-2.
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Aguero set a record in Manchester City by scoring 260 goals for the team in 390 games over a golden decade he spent with the team, during which he won 12 major titles, including 5 titles in the English Premier League, before leaving him at the end of last season.