The Serie A champions are keen to lure the attacking midfielder to Turin but must agree a deal by Monday if they are to prise him away from the Rossoblu
The Serie A champions have long been linked with a move for the attacking midfielder as they look to bolster their squad for the 2013-14 campaign.
However, they have yet to reach an agreement with Bologna about a summer move and his current club have now set Juventus an ultimatum to wrap up the transfer.
"Juventus have until Monday to complete the signing of Diamanti. If the deal's not done by then, he will stay with Bologna," Guaraldi was quoted as saying by Tuttosport.
"We will not let last year's situation with Gaston Ramirez repeat itself this season. Once our training camp begins, Diamanti will be off the market."
Bologna lost Ramirez to Southampton in the closing stages of last year's summer transfer window.
Diamanti, 30, has a contract with Bologna until June 2017.