Robert Lewandowski, Raphinha, Jules Kounde, Andreas Christensen and Franck Kessie have arrived at Camp Nou since the end of last season, but there is uncertainty over whether they will be able to make their competitive debuts on Sunday (AEST).

The Catalan giant has been busy trying to raise funds in order to meet LaLiga's salary limits ahead of the season and activated a fourth economic lever on Saturday (AEST).

Barca sold a further 24.5 per cent of its production company for €100 million ($146.1 million), having also agreed a hugely lucrative sponsorship deal with Spotify and sold a percentage of LaLiga broadcast rights.

The club has been able to lower its wage bill by offloading players and more could follow, with Frenkie de Jong and Pierre-Emerick Aubameyang reportedly targets for Chelsea.

Blaugrana head coach Xavi says he is prepared for the possibility that some of his new men may not be eligible to play this weekend.

He said: "We are working hard and everyone at the club is very positive. Maybe not 100 per cent, but we are optimistic. We'll see. The club has signed very well, I am very excited about the players we have signed. We have time until tomorrow and now we are very optimistic."

Xavi maintained his plans for the opening match of the season have not been badly disrupted by being unsure over who will be available.

He said: "It has little influence, as at the end of the day we work on different systems, different variants. Either one or the other players, very few things change.

"We pretty much have two players for each position. We work the same, we don't have a different system with the way we play in attack. Not a lot varies and I insist that right now we are very optimistic of registering the players."

Manchester City midfielder Bernardo Silva and Chelsea defender Marcos Alonso continue to be linked with Barca, with just under three weeks before the transfer window closes.

A deal to sign Alonso is reported to have been agreed and Xavi made it clear he is eager to do further business.

"We are still planning ahead, that's a reality," the former Spain midfielder said. "We are going to see what we are going to do until 31 August.

"Of course, we need to have players leave in order for others to come, but the transfer market is open until the 31st and there is work to be done for all of us. We'll see."

Xavi also revealed he wanted Nico Gonzalez to stay rather than join Valencia on loan for the season, adding: "[Nico] came to me three weeks ago. I insisted that he continue because he would have minutes. I like Nico.

"But a few days ago he came back and told me that there was a team where he would play. He has been brave and is going to Valencia.

"I hope he comes back more mature because it must be important for the future of Barca. For the midfield we have [Sergio] Busquets, [Miralem] Pjanic, Kessie, Frenkie, Sergi Roberto, and even Christensen, who can play there."