The Welsh international midfielder had been on loan at Home Park as the last season ended and now Argyle will look to sign him permanently next season.
His current deal at Selhurst Park runs out on June 30th when he's free to leave.
He's expected to agree a deal when he comes back from a family holiday during June.
His current deal at Selhurst Park runs out on June 30th when he's free to leave.
He's expected to agree a deal when he comes back from a family holiday during June.