Thomas Ince spent an impressive two months at the League One club this season, whilst defender Darby was on loan at Meadow Lane for the same period.
Liverpool were unwilling to let Ince rejoin the Magpies unless he signs a new contract. He is refusing to agree so the clubs are in stalemate.
"The situation is the same with Thomas. He's not going to sign a contract," Paul Ince told the Nottingham Evening Post. "It might change under Kenny because he might put him into their first-team squad. If he doesn't do that, I will be going in to see him.
"He's only young, he wants to play here because he enjoyed it and he wants to forward his education."
On Darby, Ince senior added: "We're trying to bring him back too because he did well."