Think I finally found an answer to the loan conundrum on The Guardian!
"Loan rules differ in the Premier League, where only one player from the same club is permitted at a time. Clubs are also allowed a maximum of only two domestic loans at a time. Yet there is no limit on international loans, which means a struggling Premier League club can transform its starting XI in January without making a permanent signing. Two years ago Hull brought five players in on loan and almost survived."
I think we can loan 2 players from Barcelona comfortably.