The Manchester United legend quit as boss of Sunderland
earlier this season.
He has since travelled the world learning new
techniques from a range of coaches.
After a spell with the New Zealand rugby union team,
Keane spent time in Portugal with Benfica boss Quique Sanchez
Flores.
He revealed: "I wanted to know the methods of Benfica's
work from the juniors to the first team.
"Benfica have some of the best faculties on the
continent.
"My future? I'm hopeful because I want to get back into
management in the summer.
"I don't know where that will be but I'm keeping all my
options open and wouldn't dismiss the possibility of working
abroad."