The Portuguese champions snatched the winner when the Brazilian met a Petit free-kick after 84 minutes.
The Brazilian striker has been ruled out of the World Cup qualifier against Argentina because of a thigh strain.
Crowd trouble forced Benfica's Primeira Liga match at Academica Coimbra to be interrupted for five minutes late in the second half on Sunday, prompting the Lisbon club to protest at heavy-handed policing.
Five-time champions Brazil qualified for the World Cup finals on Saturday after beating arch-rivals Argentina 3-1. Sevilla striker Luis Fabiano scored twice after Benfica skipper Luisao opened the scoring for the Brazilians in a fast, hard-tackling match.
Javier Saviola and Oscar Cardozo scored two goals apiece and defender Luisao was also on target as Benfica thumped Everton 5-0 in the Europa League on Thursday.
They stretched their unbeaten run under new coach Dunga to five matches on Wednesday.
Substitute forward Simao Sabrosa and central defender Ricardo Carvalho scored in the friendly international at the Emirates Stadium on Tuesday.
Benfica's Oscar Cardozo scored a hat-trick in a 4-3 extra-time win over Lisbon rivals Sporting in the Portuguese Cup last 32 on Saturday with Luisao grabbing the winner after a blunder by visiting keeper Rui Patricio.
Pierre-Emerick Aubameyang grabbed a hat-trick as Borussia Dortmund crushed Benfica 4-0 on Wednesday to advance to the Champions League quarter-finals 4-1 on aggregate.
Goals from Hulk and Axel Witsel helped Zenit St Petersburg get their Champions League campaign off to the perfect start as they beat 10-man Benfica 2-0 away on Tuesday.
Thomas Meunier volleyed a spectacular last-minute goal to give Paris St Germain a 2-1 win at FC Basel, which took them into the last 16 of the Champions League on Tuesday.
A summary of Wednesday's group matches in the UEFA Champions League.
Photos from the Champions League matches played across Europe on Tuesday
Cristiano Ronaldo renewed his personal battle with Lionel Messi by scoring his 71st Champions League goal, putting him three behind the Argentine's newly-set record, in Real Madrid's 1-0 win at FC Basel on Wednesday.
Photos from the Champions League matches played across Europe on Tuesday
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