Philippe Coutinho was everywhere for his team, chalking up two assists in addition to his three goals as Bayern pulled to within 4 points of leaders Borussia Moenchengladbach.
Philippe Coutinho has joined Bayern Munich on a one-year loan worth 8.5 million euros (USD 9.5 million) with an option to buy.
Philippe Coutinho joined Barcelona from Liverpool in January 2018 for an initial 120 million euros (USD 133 million), plus another 40 million euros in potential add-ons.
Brazil made a winning start to the Copa America on Friday with a 3-0 victory over Bolivia in the absence of superstar Neymar.
Philippe Coutinho sustained the injury on his left leg during Barcelona's UEFA Champions clash versus Inter Milan earlier this week.
Tottenham Hotspur have lost both of their group matches after a 1-2 defeat at Inter Milan in their Champions League opener.
FIFA World Cup 2018 Quarter Final, Brazil vs Belgium, from Kazan Arena: Brazil Knocked Out After 1-2 Loss To Belgium In Quarters
Brazil overcame a tricky start to the last-16 tie, as second-half goals from Neymar and Roberto Firmino sealed a deserved victory.
A largely frustrating afternoon for the five-time world champions was forgotten thanks to two goals in stoppage time.
At the final whistle, Neymar sat down on the grass and wept, with the emotion of victory hitting home after the tense Group E contest at the Saint Petersburg Stadium.
Steven Zuber powered home an equaliser from Xherdan Shaqiri's corner five minutes after the break.
Brazil are going through their paces in Sochi ahead of their Group E engagements.
Neymar's returning form will be a key factor for the team, which lost influential right-back Dani Alves to a knee injury last week.
The loss to Levante ended Barcelona's hopes of becoming the first ever club to finish a 38-game La Liga season as invincibles.
Holders Barcelona secured a place in the Copa del Rey final for the fifth season running, becoming the first side to achieve such a feat.
Coutinho, dressed in a black shirt dotted with white stars, was in the stands at the Camp Nou for the first time since his 160 million-euro ($192 million) move from Liverpool.
Coutinho signed a five-year contract to end a long-running transfer saga on Monday with Mestre revealing that Liverpool had originally asked for 200 million euros.
Barcelona are still unbeaten in La Liga this season and on Monday will officially unveil Coutinho following the Brazilian's 160 million-euro ($192 million) move from Liverpool.