Mourinho began his managerial career with Benfica in 2000 but took charge of only 10 games and left after a dispute with the club president.
He then made his name with Porto between 2002 and 2004, winning six trophies – including the Champions League in 2003-04.
Since leaving his homeland in 2004, Mourinho has managed Chelsea, Inter Milan, Real Madrid, Manchester United, Tottenham Hotspur, Roma and Fenerbahce.
He left the Turkish club on 29 August, two days after they were eliminated from the Champions League play-offs by Benfica.
Should Benfica appoint Mourinho, he would face Chelsea in the Champions League at Stamford Bridge on 30 September.
Benfica also travel to Newcastle United and host Real Madrid later in the league phase of the competition.
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