The Cottagers suffered league defeats at Manchester United and West Ham, but are hoping for a change of fortunes at Wigan as Riise steps up his return to full fitness.
"I haven't trained as much as I wanted," he said. "I was out for about 10 days because of the injury and then I played a game [at West Ham].
"Then I was on international duty, before returning and playing at the weekend, so I'm looking forward to a good week of training before the next game at Wigan.
"They've [Wigan] done well so far. They've got a great manager but they've lost a couple of players such as Victor Moses.
"We go there to try and win and get three points and it's a game that if we play our best football, we'll be in with a shout."