Juventus halted Sancho transfer because they just signed Francisco Conceicao, and they don't have enough funds to sign Sancho. They're planning on selling one of their winger in order for them to raise funds for the signing of Sancho. If Juventus did not succeed on selling either Nico Gonzalez or Timothy Weah, they might not be able to bring Sancho in. No club wants to add more players to their squad without selling to replace.
You must be joking, right? Juve signed Conceicao for €30m, while Sancho only cost them €25m. This transfer is so stupid as hell considering how average Conceicao is. He recorded 3 goals 3 assits from 26 games with Juve last season. He's so damn average, and they get scammed by Porto. Although, they paid him in four installments, still not worthy.