However, one of the issues Bielsa seeks to resolve is between the sticks.
Goalkeeper Illan Meslier was brought in from Lorient for £ 5million, but the 20-year-old is unlikely to be the No.1 pick for a starting place.
Leeds ace Kiko Casilla is set to leave Elland Road after being hit with an eight-match suspension following a racism charge in February.
Athletic claim Bielsa is considering options from Manchester United and Arsenal to replace former Real Madrid keeper.
Sergio Romero, Ole Gunnar Solskjaer’s current replacement pick, could be pushed further down the Old Trafford pecking order if Dean Henderson returns from Sheffield United.
The 23-year-old is set to challenge error-prone David De Gea for a starting spot at Old Trafford next year.
That could leave Romero, who started the 2014 World Cup final for Argentina, thinking about his future.
“In England they call it ‘enjoy the moment’ and we know we have an amazing squad and dressing room, with a union and some hard-working top footballer profiles.
“We will maintain this backbone and the number of signatures will not be very high. ”
Asked about specific transfers, Ruiz added: “I can’t predict anything.
“This is because during the detention we didn’t know what was going to happen and we generated many lists with many options and names for different positions.
“Now we will try to grow the players with preferences to strengthen the team. “