The midfielder only played in five games during his loan from Swindon Town two years ago when Crawley were managed by Richie Barker.
Rooney said: “I’m looking forward to showing the Crawley fans what I am capable of.
“It’s almost a case of unfinished business if you like because when I was here before I don’t think I started a game.
“I had a very good meeting with Mark (Yates) and Jimmy (Dack). I think I play my best football as a central midfielder and that’s the role they want me to play so I am delighted to be here and part of what they are trying to achieve.
“I’m looking forward to being back for pre-season next week and getting ready for the new season.”
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