The Cherries have enjoyed a productive transfer window, recruiting Ionut Radu, Max Aarons, Milos Kerkez, Alex Scott, Hamed Traore and Romain Faivre.
They have also signed USA international Tyler Adams from Leeds United this summer, and they could be set to raid the Championship club for another player.
According to journalist Fabrizio Romano, Bournemouth have verbally agreed a loan deal with Leeds for the Colombia international.
Sinisterra is keen to complete a move to the Cherries, with the two clubs now working to finalise the details of the loan deal.
The 24-year-old is set to travel to the South Coast to undergo a medical ahead of his potential loan move to the Premier League side.
After spending four years with Feyenoord, Sinisterra joined Leeds in a £22m transfer last summer, signing a contract until June 2027.
The attacker went on to five goals in 19 Premier League appearances in his debut season with the club, but he was unable to stop Leeds from being relegated to the Championship.
Although he found the net in Saturday's 4-3 win over Ipswich, Sinisterra now looks set to leave Daniel Farke's side and return to the top flight.