Barcelona v Athletic Bilbao preview: Barca trio in fitness race for Copa del Rey quarter-final second leg

Andres Iniesta, Sergio Busquets and Arda Turan are trying to shake off the flu in a bid to be fit for Barcelona's Copa del Rey quarter-final second leg at home to Athletic Bilbao on Wednesday night.

The trio will be included in the matchday squad if they have recovered in good time, coach Luis Enrique told a news conference on Tuesday.

"They have a fever, tomorrow we'll see how they are feeling," said Enrique, who believes his side will be up against a determined Athletic side after their 2-1 home defeat in last week's first leg.

"I don't expect anything different (from them), in fact (they'll be) more dangerous because the first-leg result is no good to them, with a win we avoid any complications," he added.

Luis Suarez is to return to the line-up after completing a two-match ban.

Barca are on a 24-match unbeaten run in all competitions, but Enrique is concerned about avoiding burnout in a side who have played 36 games this season.

"I'm concerned about the wear because we have played lots of matches and lots of minutes," he said.

"But the team are in good shape, despite playing at high intensity. Of course, it's this intensity that has us up there. It shows we are consistent."

Athletic Bilbao manager Ernesto Valverde has no fresh injury concerns. Winger Ibai Gomez (thigh) remains sidelined but Ander Iturraspe (hamstring) could return.

Meanwhile, in the other quarter-final ties, Atletico Madrid face Celta Vigo at home with a 2-1 lead on Wednesday, while on Thursday, Gary Neville's Valencia travel to the Canary Islands to play Las Palmas with the game at 1-1 and Sevilla take a two-goal advantage into their game at Mirandes, the only second-division team left in the competition.