Rebic joined Eintracht on a season-long loan from Italian club Fiorentina back in the summer of 2016.
"I don't know if it's going to happen but Ivan Perisic would be a fantastic addition for Manchester United".
Perisic would cost £48m and United would be in with a fight to lure the 29-year-old away from Inter.
Russia targeted by almost 25m cyber-attacks during World Cup
France scored four goals in a six-goal spectacle against Croatia to bag their second World Cup title in Moscow . The first came back in 1998 - Didier Deschamps , who is now the head coach , was a squad player at the time.
"Perisic is certainly a player that would fit the mould of Mourinho and Man Utd".
Manchester United return to America for the second year running as they prepare for the 2018-19 season but Alexis Sanchez and Daley Blind were the notable absentees..
Manchester United have signed Shakhtar Donetsk midfielder Fred and FC Porto defender Diogo Dalot in the summer transfer window so far.
Sanchez accepted a 16 month suspended jail sentence in February for tax fraud in Spain and under American law, no one found guilty of fraud can be granted a visa to enter the country.
A spokesperson later confirmed Sanchez's absence was down to a "personal administrative issue" which they hoped would be resolved in time to allow the player to join the squad in the United States at a later date.