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Barcelona’s Lionel Messi passes Athletic Bilbao’s Mikel San Jose during their Spanish first division game on Saturday. Barcelona assistant coach Jordi Roura said Messi seemed to have overcome a hamstring injury that has plagued him for nearly a month. Image Credit: Reuters

Madrid: Barcelona admit any chance they have of overturning a 4-0 first-leg defeat to Bayern Munich in their Champions League semi-final return on Wednesday depends very much on the fitness of Lionel Messi.

The World Player of the Year looked out of sorts in Munich last week as an energetic display from the hosts tore Barca to pieces, but Messi did come off the bench to score a wonderful individual goal and set up a second for Alexis Sanchez in Barca’s 2-2 draw with Athletic Bilbao on Saturday.

And Barcelona assistant manager Jordi Roura believes Messi has started to find his feet again after being troubled by a hamstring injury for the past month.

“Messi is the best player in the world and obviously when you don’t have him you notice it. He makes the difference,” he told a press conference.

“He will continue with his recuperation after the injury. He was very good [against Bilbao] and we hope that little by little he arrives at his best level. He will continue improving and the better Leo is, the more chances we will have against Bayern.”

Despite Messi not being at 100 per cent, Barca’s principal problem in the first leg was their defending and manager Tito Vilanova has even more problems at the back with Jordi Alba suspended for Wednesday’s clash.

Adriano returns from a ban and is expected to replace Alba, however the biggest doubt remains who will partner Gerard Pique in central defence.

Javier Mascherano returned to light training on Monday well ahead of the schedule planned for him after suffering a lateral knee ligament injury against Paris Saint-Germain on April 2 and he could be thrown straight back into the side, although Vilanova also has the option of using either Eric Abidal or Alex Song.

Bayern, by contrast, will be able to welcome back striker Mario Mandzukic after he too missed the first leg through suspension.

And, despite their comfortable lead, manager Jupp Heynckes has said he won’t rest any of his six first-team regulars that could miss the final should they be booked at the Camp Nou.

Captain Philip Lahm, Dante, Javi Martinez, Luis Gustavo, Bastian Schweinsteiger and Mario Gomez are all just one booking away from missing the showcase at Wembley should Bayern seal their passage into the final next month.

“I won’t be making any concessions,” Heynckes told the club’s website.

“I’ll select my best available team. The players will have to show great discipline, which means: no gestures, no unnecessary fouls, and they mustn’t let themselves be provoked. That’s the decisive factor.”

And Heynckes says his team’s attitude will be key if they are to avoid a monumental turnaround. “We need the same attitude, willingness to run and good tactics,” he said.

“Barcelona are still the best team in the world. We know they’re capable of stunning results at home, and they’ve overturned deficits in the past. Their pride has been wounded and they’ll give it everything they’ve got. We’ll need a top performance.”

Both Dante and Jerome Boateng missed training on Monday but both are expected to line up in central defence as German international Toni Kroos remains Bayern’s only absentee through injury.