Chelsea's Champions League fate will go to the final group game after a convincing 4-0 win over 10-man Maccabi Tel Aviv earned successive victories for the first time in two months.
Porto's home loss to Dynamo Kiev means progression from Group G is by no means certain for Chelsea, who beat Norwich last Saturday and host Jose Mourinho's former side in Europe on December 9.
A draw should be enough for the Blues to advance to the knockout stages.
Gary Cahill scored from a corner and former Chelsea defender Tal Ben Haim was shown a straight red card before half-time for a wild kick at Diego Costa, who had an altercation with Mourinho at the interval.
Willian added a free-kick strike - his sixth set-piece goal of the season - Oscar headed in a third and Kurt Zouma a fourth at Haifa's Sammy Ofer Stadium to put a gloss on the scoreline.
Meanwhile at the Emirates stadium in London, Arsenal kept their Champions League hopes alive with a routine 3-0 victory over Dinamo Zagreb.
Arsene Wenger's men had lost three of their opening four Group F fixtures, including defeat in Zagreb, and looked to be on the verge of failing to make the knock-out stages of the competition for the first time in 16 seasons.
But, knowing they needed Bayern Munich to beat Olympiacos in Germany as well as take care of their own match, the Gunners held up their end of the bargain as Mesut Ozil opened the scoring before an Alexis Sanchez double sealed a comfortable 3-0 win.