The players were expected to arrive in Cleveland on Tuesday night. They must first pass physicals and Scott hopes they will be able to practice Thursday and possibly play Friday against Milwaukee.
Cleveland is trying to maintain salary-cap space and stay away from any maximum contracts so it can be active in free agency over the next two years. General manager Chris Grant has been doing all he can to attain assets to help the rebuilding, which is taking longer than expected.
"Marreese will strengthen our front court, while Wayne and Josh will add depth to our back court," Grant said in a statement. "At the same time, we are adding a valuable asset with another future first round pick, while also maintaining our future flexibility."
The Cavaliers also waived Jeremy Pargo to create room for the trade.
The Grizzlies already owe a first-round draft pick to Minnesota, so the Cavaliers will get Memphis' first-round selection after that. The selection is protected so Cleveland could only pick between Nos. 6 and 14 in 2015 with the pick protected only for the top five in 2017 and 2018.
Ellington, picked up in a trade from Minnesota last July, helped Memphis beat Miami on Nov. 11 with a career-high seven 3-pointers and 25 points. But he has hit only 34 3s in his other 39 games this season. Selby has played in only 10 games this season.
Memphis gets 6-10 Leuer who is averaging 2.4 points in nine games. He was the 40th draft selection overall in 2011 by Milwaukee and was claimed off waivers by Cleveland in July. Leuer averaged 19.5 points and 12.3 rebounds playing with the Cavaliers' D-League team, the Canton Charge.
But the Grizzlies will need to add at least a couple players to the roster quickly. They host the Lakers on Wednesday night.