So far this summer Benfica defender Victor Lindelof and Everton striker Romelu Lukaku have arrived at Old Trafford.
Mourinho still wants two more signings and a move for Inter's Perisic is reportedly edging towards completion.
Asked for an update on the transfer after the 2-1 friendly win at Real Salt Lake, Mourinho said as he left the press conference: "No idea
No idea my friend
No idea."
United are said to be close to agreeing a £48million fee for the Croatia international after prolonged talks with the Serie A side.
Chelsea defensive midfielder Nemanja Matic is another reported target for Mourinho, while it is understood United maintain an interest in Tottenham's Eric Dier.
Source : PA
Source: PA