Paris Saint-Germain are reportedly looking to make a sensational swoop for Haaland ahead of the summer transfer window as the City striker weighs up his options.
Barcelona, who will lose Robert Lewandowski when his contract expires this summer, are on the lookout for striker ahead of the new season despite being ready to snap up Marcus Rashford.
Soler, speaking to broadcaster Cadena Ser, had admitted that Barcelona have the firepower needed to sign Haaland, but the deal must be viable.
"Yes, we could sign players like Julian Alvarez or Erling Haaland. These transfers will pay for themselves within five years, and Barcelona's finances are ready for it.
"At the end of the day, Barca must be very careful about the commitments it makes regarding its wage structure. We have set ourselves a limit, and we will not exceed it.
“We must sign players at market prices while keeping an eye on our wage structure."
Haaland's deal reportedly contains specific release clauses that could be triggered by top Spanish clubs such as Real Madrid or Barcelona, but reports also claim that he remains loyal to City for now.
The Norwegian striker, who has 22 Premier League goals this season, joined from Borussia Dortmund in 2022 and won the Premier League Golden Boot in each of his first two seasons at the Etihad.
Sport report that Haaland's City team-mate, Omar Marmoush, has been identified as a more affordable target as Haaland could cost well over £100M if negotiations did begin.