Welling United boss Neil Smith has signed three defenders ahead of the new Blue Square South season.
Ryan made 54 league appearances while with Bristol Rovers
Left-back Robbie Ryan, 30, has been without a club since leaving Bristol Rovers at the end of January, but has now signed a contract at Welling.
Also joining is Adam Cottrell, 20, who was released by League One side Millwall at the end of last season, having served Weymouth on loan.
The third new defender is Steve May, who joins from Bognor Regis Town.