The 28-year-old Croatia international has long been linked with a move to Old Trafford and Inter technical director Walter Sabatini confirmed last week that United were continuing to show strong interest.
Bet on Man Utd v Real Madrid in ICC
Goal revealed on Monday that the Premier League club are close to finalising an agreement over a transfer, with Inter ready to accept a bid in the region of £40million.
However, speaking after his side’s 2-1 friendly win over Real Salt Lake, Mourinho claimed he was in the dark over the deal.
Asked to provide an update, he said: “No idea. No idea my friend. No idea.”
Earlier, Inter sporting director Piero Ausilio denied that Perisic was close to joining United or forward Stevan Jovetic is nearing a permanent move to Sevilla.
Giggs backs Perisic to inspire Utd
“He’s close to Inter,” he said to reporters.
“Jovetic and Perisic are Inter players. There’s nothing.”
