Lionel Messi stars from midfield while Lucas Digne and Samuel Umtiti impress on their Camp Nou debuts. Oh, and Arda Turan netted twice.
Granit Xhaka is the only major arrival at the club so far.
Mane is a doubt for the trip to Turf Moor following a shoulder injury he picked up in training this week.
Massimo Cellino's time at Leeds has been mired by controversy.
The striker believes Villa keeper Pierluigi Gollini will come good.
Leeds United have signed Pontus Jansson.
Newcastle beat Reading 4-1 in the Championship on Wednesday evening.
West Ham take on Bournemouth on Sunday in the first Premier League game to take place at the London Stadium
Gouffran played his part in two of Newcastle's goals in their 4-1 win over Reading.
The Turkish international had been linked with a move to Spurs.
In Australia they call it fossicking or noodling. Sometimes it can take decades of scouring the parched outback to secure the odd rare gem – perhaps opal or gold – lying unclaimed in a remote mining settlement such as Coober Pedy. Suddenly English rugby is in a similar situation; after years of fruitless June expeditions there is finally a glint of precious metal visible in the dirt.