"Mark is a very good footballer who, while usually a right-back, can play in a number of positions. He's a great character and a leader. He will be a great ambassador for Dundalk Football Club," said boss Kenny.
Sligo native Rossiter tasted first-team action in his time with Sunderland but injury halted his progress and he returned home in 2007, spending time with Bohemians and St Pat's before his move to Dundalk.
Stephen O'Donnell, Pat Hoban, John Dillon, Andy Boyle, Keith Ward, Tiarnan Mulvenna, Richie Towell and Kurtis Byrne have also been signed up by Kenny.
Meanwhile, veteran striker Vinny Sullivan is back with Waterford United for a third spell. United have also re-signed Ben Ryan, Dylan Mernagh and Craig Burns from last season's squad. Burns' decision to commit to the Blues is a major boost as the defender had been linked with a move to England.
"We are delighted that Craig has committed himself to the Blues again. He is a super young talent, had an outstanding campaign with us last year and will be an excellent addition to the side again this season," said manager Paul O'Brien.
Ventre re-signs at champions Sligo
SLIGO ROVERS has persuaded captain Danny Ventre (pictured) to stay on at the club despite interest from clubs in England.
The long-serving midfielder was out of contract with Sligo and had been in line for a move back to England, with Tranmere and Chesterfield both keen on Ventre, but has decided to stay at the Showgrounds by signing a new deal and will be on board for their Champions League campaign.
"We have a title to try and defend now and I'm delighted to secure my future with Sligo Rovers. It is nice to put it to bed and a relief," Ventre said.
"It took some time to get everything sorted and I can't wait now to concentrate on working hard and trying to become league champions again.
"I think the new lads that have come in will be very keen to impress. I'm looking forward to working with Ian Baraclough again and you see the calibre of assistant he has brought in with Gary Stevens, which is something I think the players will relish, too. He is someone I'm looking forward to getting to know and just getting back with the lads to start the hard work again.
"It was a great honour to achieve what we did last season, and so much more as captain. That is something we can hopefully strive for again and I think we will all be driven to go for it."
Ventre's decision to stay comes days after Sligo fans received a boost with news that Evan McMillan had joined the club from Bohemians.
County keep Judge
LEAGUE One side Notts County have turned down a bid from Championship side Charlton for their Irish star Alan Judge (pictured).
Midfielder Judge has hit six goals for the Magpies this season, making him their second-top scorer, and his form has attracted interest from clubs in higher leagues. Reading have been linked with Judge, 24, but boss Keith Curle admitted that Charlton had made an approach for Judge in a part-exchange deal.
"There is no way I'd let Alan Judge leave this club for somebody else's players that aren't good enough for them," said Curle.
Judge joined the Magpies from Blackburn Rovers two years ago.
-- AIDAN FITZMAURICE