Barcelona defender Gerard Pique has warned Arsenal they cannot keep hold of captain Cesc Fabregas forever.
Barca missed out on the Gunners skipper this summer, despite pulling out all the stops to land the 23-year-old midfielder.
Fabregas, who considered a move back to the club where he played in his youth, committed his short-term future to the Premier League side but Pique believes his international team-mate will sign for the Catalans in the future.
"Cesc will one day sign for Barca," said the World Cup winner.
Pique missed Barca's 3-1 defeat by Sevilla in the first leg of the Spanish Supercup on Saturday, along with the rest of his side's South Africa finals winners.
The eight players had only been back in training for a matter of days and were also obliged to travel out to Mexico for an international friendly match.
Coach Pep Guardiola saw his squad stretched by that situation, and Barca have been short of numbers at the end of the last two campaigns as well.
This time around, Barca have signed David Villa from Valencia and utility man Adriano from Sevilla, but Yaya Toure has left the club to join Manchester City.
That leaves Barca with a small squad once again and more signings do not appear imminent.
Nevertheless, Pique believes quality is more important than quantity.
"It is better to have 19 very good players than 24 or 25 with less quality," he said.
"That is not a reference to Real Madrid. They have to strengthen more. They have to change more things to try and win, and so it's normal that they should sign more (players) than us."
Madrid are set for a change in style under Jose Mourinho and Pique is relishing the tactical battles ahead between Guardiola and the Portuguese coach.
"It will be fun. They are two coaches with different styles, even though Mourinho says he is an attacking coach," he said.
"But Guardiola has shown you don't need the character of Mourinho to become a great team."
Guardiola is likely to select several of his Spain stars on Saturday in the return leg against Sevilla, while some of the side's young players also look set to receive another opportunity.
"Using the youth team is always an effective solution for Barca," Pique said.
"They shouldn't be doubted (despite the defeat in Seville). They have shown they can perform well and we have to place our confidence in them."