The Dallas Mavericks are considered the favorites to sign Al Horford this offseason, sources tell Kevin O'Connor of The Ringer.

Horford opted out of the final season of his contract with the Boston Celtics and discussions between the two sides broke down with him now expected to sign elsewhere.

The Los Angeles Lakers and Los Angeles Clippers are also interested in Horford though they are both prioritizing Kawhi Leonard.

With the Mavericks, Horford would join a core of Luka Doncic, Kristaps Porzingis and Tim Hardaway Jr.

According to Ben Rohrbach of Yahoo! Sports, there is a belief among some inside the Celtics may be preparing an offer to Horford.