"He brought a ton to our team, more than can be evaluated just with his on-ice performance and his statistical measurements," Oilers coach Todd MacLellan said of Letestu. "He was tremendous in the locker room. Very, very well respected by his teammates, more than you can imagine, so we'll miss that part of it. Certainly a utility-type of player, penalty killing, power play, can control the fourth line.
"He had a pretty good year and a half, went a little bit dry for us lately, but I know he'll be a good asset for Columbus now that he's there."
Aberg, 24, has eight points (two goals, six assists) in 37 games for the Predators this season. Selected by Nashville in the second round (No. 37) of the 2012 NHL Draft, he has 10 points (three goals, seven assists) in 52 NHL games.
He had five points (two goals, three assists) in 16 Stanley Cup Playoff games last season to help Nashville reach the Stanley Cup Final, where they lost to the Pittsburgh Penguins in six games.
Aberg can become a restricted free agent after the 2019-20 season.
"We're going to give him an opportunity to play with good players," MacLellan said. "Our lineup is full of good players, but [we'll] play him in a situation where we think he can succeed. We believe he's got some offensive talent and some pretty good instincts. Does that warrant power-play time? We've got to figure that out. Where is he the most effective and who will he be effective with? That'll take some time to figure out."