Inter have insisted the Perisic will remain in Milan and Ausilio reiterated the Serie A club's stance regarding the Croatia worldwide winger and team-mate Antonio Candreva, who is reportedly a target for Chelsea.
"Perisic is a very important player for us".
Mourinho feels that the Glazer family are trying to do business on the cheap, despite spending over £100million to land Romelu Lukaku and Victor Lindelof this summer. He is an Italy International and he only arrived one year ago.
Ausilio added: "The player is willing, and I've spoken to Nice and think everything is going in the direction that we hoped".
In the summer of 2009, Mourinho made three landmark signings via Lucio, Wesley Sneijder and Diego Milito yet was also lumbered with one of European football's finest marksmen in Samuel Eto'o after Barcelona struck a part-exchange deal for Zlatan Ibrahimovic.
However, the newspaper says that despite the frustration at dealing with the Italian giants, United remain confident they will eventually reach an agreement to sign the £48m-rated winger.
Serge Aurier has been offered to United after being told he can leave PSG, who are looking to recoup funds after their world-record signing of Neymar, while Luke Shaw has impressed Mourinho sufficiently to all-but end his interest in signing another left-back.
"That makes it interesting as well because if you look at the other teams as well, they're all bringing good players in because they all want to win the league or do well in the Champions League".
Mourinho has publicly criticised the failure to sign players, regularly putting pressure on executive vice-chairman Ed Woodward who is tasked with leading United's negotiations in the transfer market.