Capitals coach Adam Oates announced the move before the Capitals (0-3) were to face the Devils (2-0) at the Prudential Center.
Oates moved Ovechkin to right wing at the start of the season, but moved him back to the left side in the third period of Thursday night's 4-1 loss to the Montreal Canadiens.
"Of course I feel much (more) comfortable on the left side. It's no secret," Ovechkin said before the game.
Asked if he was unhappy playing right wing, Ovechkin added: "No, I was happy. But again, I think I was not happy how we play like a team."
Ovechkin, who has scored at least 30 goals in each of his first seven seasons, has one assist in three games.
Information from ESPNNewYork.com's Katie Strang and The Associated Press was used in this report.