Patrick Roberts, Bailey Wright and Lynden Gooch have all signed new contracts on Wearside, while goalkeeper Anthony Patterson has agreed a new long-term deal.
Centre-back Daniel Ballard has also joined the club from Arsenal on a permanent transfer.
Still, there is work to be done in the transfer market if Sunderland are going to be competitive in the Championship.
We took a look at the contract lengths of those senior players who will remain at Stadium of Light next season as things stand:
Still, there is work to be done in the transfer market if Sunderland are going to be competitive in the Championship.