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Published 09:08 13 Jun 2016 BST
Updated 14:17 13 Jun 2016 BST
"I like to play football, but the motivation is still not strong enough to run the race at the highest level," Riise writes. "Perhaps the joy and the necessary motivation will come back at some point, what do I know, but now it's not big enough. "I'm sorry. Especially facing the team, the whole club and all the supporters."Riise began his career with Aalesund 20 years ago, before returning this year after spells in Monaco, England, Italy, Cyprus and India. He won more than 100 caps for Norway before retiring from international football in 2013.
