Both players join Hull on-loan to the end of the season, with Koumas arriving from Liverpool and Collyer from Manchester United.
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"The Championship is different to the Premier League – it's hectic but I like it," Collyer told Hull's website upon signing.
"You face challenges every day in training and in matches and it's a great league to get better.
"I'm looking forward to the atmosphere, seeing the fans and playing with my new teammates."
Koumas, 20, also stated: "I enjoy the intensity of the division and the eagerness of every team wanting to go to the Premier League.
"Playing here for the team, with the tiger on my chest, is going to be great. I can't wait."