There was serious concern surrounding Sergio Aguero on Saturday night.The Barcelona striker had to be substituted just before half-time of his side’s La Liga clash against Alaves after suffering what appeared to be breathing problems.He was immediately rushed to the hospital for checks.ENTER GIVEAWAYAnd results of those tests have now emerged.According to Sport, he has been diagnosed with a cardiac arrhythmia - an irregular heartbeat. It’s something that Aguero has previously suffered with at the start of his football career.Further in-depth tests will be carried out over the next few days to determine the severity of the condition.The report states Aguero is ‘worried’ about the situation and the uncertainty that surrounds it.

It’s highly unlikely he will be fit to play in Barcelona’s Champions League clash against Dynamo Kyiv on Tuesday.

It’s been a rough start to life in Barcelona for Aguero.

He left Manchester City in the summer on a free transfer thinking it would give him the opportunity to play alongside compatriot, Lionel Messi.

However, within a few weeks, Messi was on his way to Paris Saint-Germain.

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To make matters worse, Aguero picked up a tendon injury which meant he was unable to make his debut until October 17 when he came off the bench against Valencia.

A week later, he came off the bench to score in El Clasico - although Barca lost 2-1 to Real Madrid.

And now, on his first start at the Camp Nou, he was forced off with this heart issue before half-time and now faces an uncertain future.

We really hope Aguero will fully recover from these complications and be back scoring goals soon enough.