It's been in the works for a few weeks now, but the Birdman signing (and connecting move of trading Sasha Kaun) appears to be agreed upon and ready to go, first reported by The Vertical's Adrian Wojnarowski.
Tom Withers of the Associated Press adds that it will be for the veteran's minimum
Chris "Birdman" Andersen has agreed to 1-year contract with #Cavs. Deal is veteran minimum, still not signed.— Tom Withers (@twithersAP) July 15, 2016
Andersen, 38, averaged 4.6 points, 4.5 rebounds, and .5 blocks across 18 minutes per game in 20 contests with the Grizzlies last season. He also played 7 games with the Miami HEAT. He will see a similar, if not smaller role with the Cavs, who lacked a true center with the departure of Timofey Mozgov. Tristan Thompson is a stud at the position, and Channing Frye and Kevin Love both play it well, but a player with the size of Andersen was needed to soak up minutes against the likes of Andre Drummond and Hassan Whiteside.
Andersen reunites with LeBron James and James Jones, teammates from the HEAT, and JR Smith (assuming he re-signs) who played with him in New Orleans.