Angel Correa has begun training with Atletico Madrid for the first time this week.
Correa underwent surgery in the summer after it was discovered he had a heart defect - a setback which put his transfer to Atlético on hold.
He is now training with Atleti and if he can prove his fitness the transfer from San Lorenzo will be confirmed.
Correa, 19, is expected to complete his €7.5 million move to Madrid in January.
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