Spurs unwilling to part with England international after sanctioning sale of Kyle Walker to Manchester City.
The Real Madrid striker is unlikely to move to Old Trafford following the arrival of Romelu Lukaku.
Jose Mourinho also confirmed Morata was wanted by the Red Devils this summer.
Baars' father confirmed the 16-year-old was wanted by Chelsea and Arsenal.
Anthony Martial was the initial swap deal that the Serie A side was looking for.
Mourinho also downplays the possibility of United signing Alvaro Morata from Real Madrid.
United have completed deals for Romelu Lukaku and Victor Lindelof so far.
Reports from Italy suggest the Nerazzurri have enquired as to a potential part-exchange deal.
Ibrahimovic was released by United after the striker's contract expired in the summer.
Martial struggled in his second season at Old Trafford while Ibrahimovic scored 28 times.
Nemanja Matic has made 30 appearances for Chelsea in the league.
De Gea has 2 years left on his United contract.
The 35-year-old held a four-hour meeting with agent Mino Raiola and confirmed "huge" announcement is imminent.
Piero Ausilio says Inter have not taken United's offer into consideration.
Tottenham's Dier was Mourinho's primary midfield target this summer.
Chelsea are believed to let Matic leave after they complete Tiemoue Bakayoko signing.
Spurs manager Mauricio Pochettino intends on keeping Dier at the club.
Januzaj says his time at United 'didn't go the way' he wanted it to go.
Dier wants to leave Tottenham for Old Trafford, according to reports.
United have not made any bids with AS Monaco for Bakayoko.
Ernesto Valverde has identified Herrera as an alternative to PSG's Marco Verratti.
The 35-year-old set to be handed deal until the end of the season.