Federer, who had a friendly match with the superstar at the ongoing International Premiere Tennis League, was enthralled by the first poster of "PK" and told Aamir that he will be watching the film.
"When Roger met Aamir he first spoke about the poster of 'PK'. He was very excited to know the idea behind the poster and told Aamir he would be watching the film when it releases," Aamir's spokesperson said in a statement.
The movie, which also stars Anushka Sharma, will hit the screens Dec 19.