Barcelona interim coach, Sergi Barjuan, has provided the latest update on Sergio Aguero after being taken to the hospital for heart tests.
Barjuan said Aguero is 'calm' about his situation as tests continue to be carried out.
Aguero, who recently returned to fitness after several months on the sidelines, felt pains in his chest during Barcelona's LaLiga 1-1 draw with Alaves on Saturday.
The Argentine international was substituted and taken to the hospital as a precautionary measure after he complained of dizziness.
Speaking at his pre-match press conference on Monday ahead of Barcelona's Champions League clash with Dynamo Kyiv on Tuesday night, Barjuan said, "Kun's absence is very important.
"I spoke with him yesterday and he is calm. He is locked away in his room, but he is calm."
Meanwhile, Barjuan has already released his squad to face Dynamo on Tuesday.