Sergio Aguero has announced his retirement from football at the age of 33 due to a heart condition.

The Manchester City record goal-scorer, who moved to Barcelona on a free transfer in the summer, had to be substituted during his team's 1-1 draw with Alaves in October after receiving medical assistance on the pitch to treat chest pains and dizziness.

The Argentina striker was taken to hospital for cardiac tests, after which he was ruled out for three months.

However, Aguero did not make his return to the field before announcing on Wednesday at the Camp Nou that his playing career has ended.

An emotional Aguero said: "This conference is to communicate that I have decided to stop playing football.

"It is a very difficult moment. The decision I have made I have taken for my health, that is the main reason, because of the problem that I had a month-and-a-half ago.

"I was in good hands of the medical staff who have done their best and have told me the best thing would be to stop playing.

"So I made that decision about a week ago and I want to tell everyone I did everything possible to have hope, but there wasn't very much."

City manager Pep Guardiola was one of several representatives from Aguero's former clubs to attend Wednesday's press conference, while the club also paid tribute to their former striker on social media.

"Everyone at Manchester City would like to take this opportunity to thank @aguerosergiokun for his incredible contribution to our success over the last decade and wish him well in his retirement," City posted on Twitter.

In November, Aguero responded to rumours about his retirement and tweeted that he was feeling "positive" and making "progress" with his health.

After his first game in charge of the club against Espanyol in November, Barcelona boss Xavi said the forward's situation was uncertain, but that the club would "follow the evolution of what he had" and hoped he would be able to "keep playing football".

Aguero agreed to join Barcelona in May, signing a two-year deal with a buyout clause of €100m (£86m) after leaving City.

However, he was ineligible to play for the club until the end of August after financial fair play rules in Spain prevented the La Liga side from registering new signings.

The forward then suffered a calf injury which ruled him out until October, after which he was able to make his debut for the club as a substitute in a 3-1 win against Valencia.

He scored his first goal for Barcelona against Real Madrid on his El Clasico debut on 24 October.