New Sunderland manager Roy Keane has raided former club Celtic to sign defender Stanislav Varga and midfielder Ross Wallace.
Stan Varga has returned to Sunderland
BBC Sport understands that Celtic could receive more than £1m for the pair who have been on the fringes of the first-team under Gordon Strachan.
Wallace, 21, has signed a three-year contract, while Varga's is two years.
It will be a second spell on Wearside for the 33-year-old, who moved to Celtic in 2003.
Varga had appeared likely to leave Celtic in the summer but signed a new, one-year contract.
Wallace, a left-sided midfielder who has been deployed at left-back on occasions, had been on trial at Birmingham City during the summer.