Cotterill has not been involved since the Swans won promotion to the top flight and his last appearance for Brendan Rodgers' side was back in January.
"As soon as the loan window opens, I'll be looking to get out and play a few games," said Cotterill in the Evening Post.
"It's really frustrating at the moment that I'm not playing. I'm not even travelling with the team so it's important I go somewhere else to give me the best chance of getting in the Welsh squad.
"My future's not looking very bright at Swansea, that's no secret because the gaffer's put it out in the press.
"It's been very difficult because I thought I'd come back this season with a clean slate. I kept my head down and worked hard, but obviously that wasn't enough because I didn't even get to travel for the tour of Austria.
"It's frustrating because I do really like the club. When I left Sheffield United I wanted to settle at a club for a good few years, but that's not going to be the case.
"The manager's been up front with me. It's just disappointing because I want to play for someone as good as him."