The Kings host Northwest Division leader Edmonton on Thursday at Staples Center, and Gagne said he expects to play, barring any setbacks over the next two days.
"I should be good to go Thursday," he said.
Gagne, acquired in the offseason via free agency from Tampa Bay, has mixed well on the top line with center Anze Kopitar and right wing Justin Williams. In their first nine games together, they combined for 10 goals and 17 assists, helping the Kings to a 6-2-1 start.
The Kings went 0-1-1 in Gagne's absence and the team combined for four goals.
Dustin Penner took a majority of the shifts on the top line in Gagne's absence, but the former 30-goal scorer spent the last two periods of a 3-2 loss Sunday in Colorado on the third line with Jarret Stoll and Brad Richardson. Kings coach Terry Murray said he liked the effort Penner brought to the third line.
"There seemed to be a little more work involved," he said.
Penner is still seeking his first goal of the season, and he has just three in 38 games since Los Angeles acquired him from Edmonton in late February.
Dan Arritt covers the Kings for ESPNLosAngeles.com.