Mourinho has also been linked with a return to Real Madrid, but did not comment on the rumours linking him with Los Blancos.
The fee reflects the slightly-less-than two years Mourinho had remaining on his contract, an improved deal which had been agreed a year ago.
The 55-year-old has now finally broken silence on the claims, putting speculation firmly to bed.
Jose Mourinho has only been out of a job for a few weeks, but he is already set to return to our television screens.
The La Liga giants are struggling domestically at present, meaning Santiago Solari is already under-fire despite only replacing Julen Lopetegui earlier this season.
United sacked Mourinho on December 18 following the club's disappointing first half of the season and multiple reports of issues between the manager and players including star midfielder Paul Pogba.
Jose Mourinho will join beIN SPORTS, the global sports broadcaster, this week as part of the AFC Asian Cup 2019 and English Premier League coverage, which viewers across the Middle East and North Africa (MENA) enjoy exclusively on the leading sports channel.
"When a professional returns or is invited to return to a club, it's a great honour".
"I don't really want to go there but the best way to respect a great club [Benfica] and a great president is to say that I was not approached. Everything has been sorted", said a source close to the former United, Inter and Real Madrid boss, the Daily Mail reported.
"He told them he was the manager of Manchester United and totally committed to the club".
"(But) I think I can say that today, I don't have any intention of coming back to work in Portugal", he said.
Benfica's previous coach, Rui Vitória, left by mutual consent last Thursday with the Lisbon club third in the league and has now taken over at the Saudi club Al-Nassr.
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