Chris Iwelumo isn't sure Chris Coleman is the right man for Sunderland and also questions whether Simon Grayson should have been sacked.
Victory at Norwich means Derby have now won three straight Championship matches since their triumph over Nottingham Forest.
Leeds United beat Brighton 2-0 on Saturday, thanks to two goals from Chris Wood.
Iwelumo played alongside the Sheffield Wednesday forward at Watford.
Mark Warburton's Glasgow Rangers side are due to take on Hibernian in the Scottish Cup final at the weekend.
Leeds United won against Bolton Wanderers in the Championship at the weekend.
The former Scotland international was lately at conference side Chester.