When Milan Michalek banged his head off the ice in Buffalo Dec. 13, he led the NHL with 19 goals.

Three weeks later, the Senators winger is in his first four-game slump of the season — and still looking for No. 20.

Michalek, in fact, has just one assist in the four games he has played since returning from the concussion he sustained in a collision with Erik Karlsson.

"I thought was fine," coach Paul MacLean said after Monday's 3-2 overtime win over the New Jersey Devils. "He had some opportunities. The puck hasn't gone in the net for him since he came back, but he's playing fine."