The shirtless Inter Milan talisman is seen on Instagram with Wanda Icardi, who also serves as his agent.
She is topless and pushes her chest against his torso in the snap that has so far been liked by almost 290,000 people.
One commented: “What a fire of a couple.”
The post comes as Icardi nears the San Siro exit, with reported suitors around Europe.
The Red Devils have continually been linked with the Argentinian over the past few seasons.
And their interest is likely to peak even more after the side’s dismal run of form under new boss Ole Gunnar Solskjaer.
United drew on Sunday with Chelsea, who they now lie three points behind in sixth place.
They need to finish in the top four to qualify for next season’s Champions League.
But that now looks unlikely with only two games to go and a markedly weaker goal difference than the Blues.
Meanwhile Icardi has been embroiled in an ongoing dispute with Inter, with Wanda playing a role in the unrest.
He was stripped of the captaincy at the club, while his wife Wanda has been pushing for her fella to get a pay rise or a move to a European giant.
New boss Luciano Spalletti accused Icardi of having “humiliated” the club with his behaviour.