The Manchester United legend, 51, took a dim view of the defeat to Juventus at Old Trafford.
Mourinho suggested there was a gap between the teams as a defence but Ince laid the blame for that on the manager.
He told Paddy Power: "It looks to me like Jose Mourinho is stuck between the devil and the deep blue sea.
"Realistically, he wants to play defensively and nick a one nil win, but he knows that the fans and players at United won’t accept that. And they’re right not to.
"We’re three seasons into Mourinho’s reign now. There are no more excuses.
"You’ve spent a lot of money, if I was managing a team and they’d given me three years, and it was clear we weren’t up to standard, I’d expect to lose my job.
"Are we getting to the stage where United just aren’t good enough? Yes. They’re slipping too far behind, and can’t compete with the best sides any more.
"They’re not even showing signs of improvement. In fact they’re going backwards. He bought Fred who can’t get a game, and the same goes for Alexis Sanchez. He’s disappeared! His career has gone backwards."
Sections of the United faithful have pinned the blame for their struggles on the club's board.
But Ince reckons while Ed Woodward is not blameless, the fault lies with Mourinho.
He added: "I can see why there’s been criticisms of the board. But, in their defence, you can’t go and spend £50 million on Fred just to stick him on the bench. You can’t keep getting away with it and expect not to be questioned.
"Mourinho is too focused on what the opposition are doing. Focus on your own team, instead. Your players look completely scared, they have no confidence at all.
"The sad fact is United have no presence any more. Liverpool do, Man City clearly do, even Chelsea in such a short time are showing what they’re made of.
"Why after three years are Manchester United still trying to find a winning formula under Mourinho?"
Paul Ince was speaking exclusively to Paddy Power News. To read more, visit news.paddypower.com
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