Steven Tyler reportedly suffered a seizure in Brazil.

The 69-year-old rocker revealed on Tuesday (26.09.17) that his band Aerosmith's final four South American concerts had been cancelled because of his ''unexpected medical issues''.

And sources have now told Boston.com the 'Pink' singer had suffered a seizure after the group's show in Sao Paulo on Monday (25.09.17), though it is unclear what caused it, or whether Steven received a diagnosis before flying back to the US.

The group revealed when they cancelled the shows the veteran rocker had been advised not to ''travel or perform''.

Their message read: ''Unfortunately, due to unexpected medical issues, lead singer, Steven Tyler, is seeking immediate care and has been advised by his doctors that he cannot travel or perform at this time. Therefore, the last four shows of the South American tour will be cancelled.''

And Steven added his own statement to the message, in which he assured fans he isn't in a ''life threatening condition'', but needs to receive immediate medical care in order to ''maintain [his] future performances''.

He wrote: ''To everybody in South America....Brazil, Chile, Argentina and Mexico....I'm very sorry and feel like I've let you down..I won't be able to continue the last four shows of this tour. I flew back to the US on doctor's orders last night after the show in São Paulo.

''Please not to worry...

''I am not in a life-threatening condition, but I need to deal with this right away and get some rest and medical care immediately in order to sustain and maintain my future performances....I promise I'll be back...unfortunately, health does not wait and it's something even I can't schedule around our shows.....As they say, 'We humans make plans, and God laughs....' I love you all and will be back with you soon..... (sic)''