The 62-year-old Portuguese coach, who began his career with the Lisbon side in 2000, emphasized that his return is not about “waging war” on Porto or Sporting, though he acknowledged he expects a chilly reception when Benfica visit the Dragao in October.
"I didn't come to Benfica to upset Porto. I came to Benfica to enjoy the opportunity to once again coach a club with winning ambitions at a high level,” said Mourinho.
“By saying that Benfica is one of the biggest clubs in the world, I'm not saying that Porto isn't. If someone asks me if Porto is a giant club, I'd say yes. FC Porto is a very important part of my history, and I am a very important part of FC Porto's history."
Benfica are gearing up for their upcoming league fixtures as they press on in the title race under Mourinho.
All eyes are already on the October 5 showdown at Porto, a match expected to be intense given the fierce rivalry between the two clubs.