Jack Ross's Sunderland side have already been busy so far this summer.
Nolan and Nsiala have both handed in transfer requests at Shrewsbury Town, as reported by BBC Sport.
At the moment Ipswich Town are leading the chase, but Sunderland may be wise to join the race for the pair.
Jack Ross’s side have already made additions in central defence and midfield this summer, but Nsiala and Nolan are proven quality at League One level.
The pair were two of the brightest players in the third tier last term, and would increase the options available to Ross at the Stadium of Light next season.
Sunderland were first interested in Nsiala and Nolan when Chris Coleman was in charge.
But if the pair do still remain on their radar, then now would be the prime time for Sunderland to make their move.