Benfica appointed Jose Mourinho as their coach on Thursday, with the Portuguese returning to work in his homeland, 21 years after leaving Porto for Chelsea.
The 62-year-old, who also coached Real Madrid and Manchester United among other clubs, was sacked by Turkish side Fenerbahce in August after Benfica beat them in the Champions League play-offs.
Mourinho has signed a contract "to run until the end of the 2026/27 season", Benfica said in a statement, with an option for either party to end the deal at the end of the current campaign.
The two-time European champions sacked Bruno Lage after a shock defeat in their Champions League opener against Azerbaijani minnows Qarabag on Tuesday.
Mourinho will soon face reunions against former sides Chelsea and Porto, in the Champions League on Sep