Porto players Jorge Fucile (L), Lucho Gonzales (C) and Lisandro Lopez share a joke during their team's training session at the Dragao Stadium in Porto on Tuesday.Photo: AFP

They may be on the verge of a Champions League quarterfinal berth, but Schalke 04 travel to FC Porto for Wednesday night's second leg with the side in turmoil.
Schalke suffered their third straight Bundesliga defeat when they were beaten 1-0 at home by league leaders Bayern Munich at the weekend with fans waving a banner saying: "Mirko Slomka (the Schalke coach) - no idea, no concept, no confidence!".
A frank 90-minute discussion followed on Sunday between the coach and club president Josef Schnusenberg - Slomka's biggest public critic - and failure in Portugal could mean the end of his reign at the Royal Blues.
And Schalke captain Marcelo Bordon is also far from pleased with the situation going into such a crucial European tie.
"Our game last weekend was missing everything, we had no aggression - that is not the Schalke which I know," Bordon told German agency SID.
The Brazilian went as far as to single out the below-par performances of his teammates, especially forwards Gerald Asamoah and Vicente Sanchez.
And with suspended Germany midfielder Jermaine Jones missing against Bayern, an area where Schalke struggled, Bordon slammed his colleague.
"We need men at the moment, not people who pick up stupid red and yellow cards."
The squads' lack of unity was shown before their Champions League group stage game against Rosenborg when Mladen Krstajic and Ivan Rakitic were suspended for going to a disco.
"We must stand together now, we have to get through this phase in the competition," said Schalke manager Andreas Mueller.
Porto coach Jesualdo Ferreira knows his side have to overturn a 1-0 deficit from the first leg if they want to reach the last eight.
If they succeed in qualifying for the quarterfinals, it will be the first time the German club have been knocked out of UEFA club competition by Portuguese opponents.
The first game at the Veltins Arena was a tight affair with a solitary goal by Schalke's Kevin Kuranyi inside the first four minutes settling the contest on March 5.
Porto are 12-points clear at the top of Portugal's La Liga and were held to a 0-0 draw with mid-table Boavista at the weekend.
In contrast, Schalke are down to sixth in the table and defeat at the Estadio do Dragao could well be Slomka's last.