The sources said that Durant, who attended Drake's recent show in Toronto, was the subject of what the league regards as a public recruiting pitch from the famed Canadian artist.
In September 2013, Drake was formally named the Raptors' global ambassador.
"Before we leave, I just want to show one of my brothers something," Drake announced to the crowd. "You know, my brother Kevin Durant was kind enough to come to the show tonight and watch us. I just want him to see what would happen if he came to play in Toronto. Let him know what would happen."
The Oklahoma City Thunder star and reigning NBA MVP then received an ovation from the crowd, which reportedly launched into a "KD" chant.
Durant becomes an unrestricted free agent in the summer of 2016 and various teams -- notably his home-state Washington Wizards as well as the New York Knicks, Brooklyn Nets and Los Angeles Lakers -- are already known to be positioning themselves to have sufficient salary-cap space to make a run at him.
Drake hosted the 2014 ESPYs.
Check out the video below for Drake's shout out that ultimately cost the Raptor's $25K: