The Bruins intended to complete contracts with restricted free agents McAvoy, 21, and Carlo, 22, by the time camp opens in September to avoid starting the season without them (they have to sign by Dec. 1 to play in the NHL this season).
But Boston president Cam Neely told NBC Sports Boston that talks are status quo and compared negotiations around the NHL to "sweeping mud."
"We do have to plan and prepare for these players to not be at camp opening day," Neely said.
McAvoy had 28 points (seven goals, 21 assists) in 54 games with Boston last season; Carlo had 10 points (two goals, eight assists) in 72 games.