Stephen Kenny has bolstered his squad with the addition of the former St Patrick's Athletic and Bohemians player who had been out of contract ahead of the 2013 season
The 29-year-old former Bohemians player had been out of contract and seeking a new club as part of the Professional Footballers' Association of Ireland (PFAI) team that competed in Norway recently.
Rossiter most recently played for Liam Buckley's St Patrick's Athletic but an injury disrupted 2012 saw his chances limited.
Speaking to the dundalkfc.com, Rossiter said that he was 'excited' about the opportunity to work with Stephen Kenny.
"I had been training with St Pat's but once Stephen spoke to me about this project at Oriel Park I was happy to sign," he said. "When Stephen was talking to me about it he was so excited about it himself that I couldn’t help be inspired by his words.
"I think you can see from the signings he has made that we will be a good side and play in the right manner," added Rossiter.
Elsewhere, newly promoted Limerick have continued to build their squad ahead of the new season as Pat Scully and David O'Leary opted to re-sign for the club.
After being appointed as the Blues' new manager, Stuart Taylor has managed to persuade the duo to remain for 2013.