Classy Argentine playmaker Pablo Aimar will leave Benfica after a five-year stint in which he won one league title.
Benfica are more technically gifted than Chelsea but will still go into Wednesday's Europa League final as the underdogs.
Chelsea's march towards either more European glory or an heroic, battle-weary failure, continues when they face FC Basel.
Ramon Diaz, who steered River Plate to seven major trophies between 1996 and 2002, is returning to the club.
Barcelona beat Benfica 2-0 in a Champions League Group G encounter in Lisbon as Alexis Sanchez and Cesc Fabregas both scored.
Celtic failed to make it three home wins from three Champions League games against Benfica as a scrappy opening Group G match ended 0-0.
Benfica have agreed to sign Dutch winger Ola John from Twente Enschede on a five-year contract.
Chelsea will once again meet Barcelona in a Champions League semi-final after being made to sweat late at 10-man Benfica in a 2-1 win.
Two goalkeeping errors allowed Benfica to score two away goals as Zenit St Petersburg won 3-2 in their Champions League last-16 first leg.
A solitary first half goal in a 1-0 win over Otelul Galati was enough to ensure Benfica's progress as winners of Champions League Group C.
Manchester United boss Sir Alex Ferguson was upbeat in his assessment of his team's performance against Benfica in the Champions League.
Manchester United's Champions League hopes are still in the balance going into their final group game after they drew 2-2 with Benfica.
Benjamin Huggel struck a second-half equaliser to earn Basel a 1-1 draw at Benfica in Group C of the Champions League.
Goals from Bruno Cesar and Oscar Cardozo earned Benfica a convincing 2-0 Champions League Group C win at Basel.
An Arsenal side deprived of captain Cesc Fabregas and showing characteristic fragility in defence were defeated 2-1 by Benfica.
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