Claudio Ranieri called Guus Hiddink to thank Chelsea for their role in handing Leicester the Premier League title.
Ranieri, who was sacked by Chelsea owner Roman Abramovich in 2004, guided the Foxes to a remarkable title success, sealed when Tottenham conceded a two-goal lead to draw 2-2 in a bad-tempered clash at Stamford Bridge.
Spurs needed to end their 26-year wait for victory at Stamford Bridge to have any hope of overhauling the Foxes and were 2-0 ahead at half-time through goals from Harry Kane - his 25th in the league this season - and Son Heung-Min.
Gary Cahill pulled a goal back before substitute Eden Hazard belatedly rediscovered his blistering form of last season with the goal which denied Spurs and saw Leicester crowned champions.
Chelsea interim boss Hiddink said: "I got a call from Ranieri. He called and thanked us for what we did, especially the second half, and I congratulated him for being champions.
"(He said) five times 'thanks', because of the emotion. I didn't see any tears because it was not a Facetime conversation, but his voice was trembling a bit."
Hiddink paid tribute to Leicester after their historic title triumph, which was 5000-1 at the start of the season.
He said: "They didn't implode. There was no tension when they started smelling the title. That's why I think they deserve it highly."
Spurs boss Maruicio Pochettino made a point of congratulating the champions in his press conference.
He said: "I want to congratulate Leicester Football Club, Claudio Ranieri, all the players. I think it's a fantastic season for them.
"It's not the right moment to analyse the game. Our players are feeling very disappointed and sad now but this is a good feeling. It's a feeling we need to feel and for the future.
"We're the youngest squad in the Premier League and we're in a position that is fantastic."