Former Leicester manager Nigel Pearson says he felt proud but "very detached" when they won the Premier League.
He said it was a "big shock" to be sacked in June 2015 by the Foxes, who won their first top-flight title under Claudio Ranieri last season.
Pearson, in charge at Championship club Derby County since May, says he found being out of the game tough at times.
"They've gone on and achieved something that really, in the modern game, is impossible," he told Football Focus.
"I'm delighted for the players and the staff there.