Morris is fuming after his team’s televised 3-0 loss at Brighton amid just one win in nine Championship games.
Despite only bringing McClaren back to Pride Park last October, 17 months after he was first sacked, he has again been shown the door.
Now Morris hopes to beat Championship rivals Norwich for the services of Rams’ old boy Rowett, 43, who has impressed bossing Burton and Birmingham.
Assistant manager Chris Powell and technical director Chris Evans have also left County as part of a large scale shake-up.
Tech tycoon Morris had intended to conduct a wide-ranging summer review at County but has brought forward his plans.
He is fuming with many of the club’s under-performing stars after sanctioning a large wage bill at well-supported Derby, who have 23,000 season ticket holders.
MirrorSport understands Abdoul Camara , Matej Vydra , Jason Shackell and Nick Blackman now face likely summer exits. Even former golden boy Will Hughes, who has disappointed this term despite being given a new deal, might be sacrificed.
Morris wants County to push for a Premier League return next season but cannot pump in millions more of his own cash due to Financial Fair Play rules.
His cull has included Evans after a bungled January window when they preoccupied themselves failing to bring back Chris Martin from his Fulham loan. Other moves for Henri Lansbury, Yanic Wildschut and Bakary Sako also failed to come off.