The former Brighton winger has failed to settle at the Stadium of Light since his move last summer, and isn’t believed to be in manager Dick Advocat’s long-term plans.
Bournemouth, meanwhile, are searching for alternative attacking options after big-money signing Max Gradel was ruled out until the new year with a knee injury sustained in Saturday’s draw with Leicester City.
The former St Etienne winger was expected to play a key role in the Cherries' debut Premier League campaign, but his untimely injury has forced the club to look for late additions.
Eddie Howe is thought to rate Buckley highly and is interested in taking him to Dean Court on loan, but Sunderland are only interested in a permanent deal.
The 25-year old was linked with Leeds United earlier this summer but issues over his wage demands are believed to have scuppered a deal, as reported by the Yorkshire Evening Post.
The Whites have moved to add Jordan Botaka to their ranks ahead of the deadline, as announced on the club's official website, bolstering their options on the flanks in the process, so that may leave the door open for Bournemouth to make their move.