Mignolet and his fellow goalkeepers are now adapting to life under Domenico Doardo.
The highly-rated Sunderland No1 said: "I had the same when Steve Bruce left the club as well. When Seamus [McDonagh] came in, we worked well together. Now Domenico has come in.
"In the first week you have to adapt to each other and you have to learn what his thoughts are and he what your thoughts are.
"But for me personally, I am not the most difficult guy to work with so we adapted fairly easily."