Mourinho admitted his team were "lucky" to go in at half-time at 1-1 after Anthony Martial had cancelled out Callum Wilson's opener after what he described as some "absolutely awful" defending in the first half. Alexis Sanchez and Jesse Lingard are expected to be involved in the match. As a team we didn't press or do any of the week we did in the week.
Some United fans attempted to argue that he had merely fallen over but few were willing to fall for the antics.
Rooney, who won five league titles and a Champions League during a glittering 13-year career at United, said the players were still behind Mourinho.More news: Mike Pence compares himself to Oprah while stumping in Georgia
Bournemouth started the game well and got the lead when Callum Wilson scored from close range during the 11th minute of the game.
Rashford miss has Jose in disbelief!
On the other hand, Bournemouth boss Eddie Howe told BBC Sport: "It is a tough one for us to take, we feel we produced a really good performance particularly in the first half, and we deserved more than the goal we got".
Bournemouth had a remarkable double escape in the 65th when Nathan Ake threw his body in the way of a shot from England striker Rashford after Young had hit the woodwork.More news: Critics compare Trump's midterm spot to racist Willie Horton ad from 1988
You did not need to be a body language expert to know what was on Mourinho's mind as he slouched on his bench in annoyance at the game. This loyalty, this trust has started showing up, this season especially where Bournemouth have been exceptional.
Rooney, who became United's record goalscorer before leaving in 2017, believes it is down to the team's highly-paid stars to play with more pride and passion regardless of their issues with Mourinho.
The Cherries continued to dominate thereafter, with United far too disjointed on the ball and distinctly reactive off it.More news: Curry sets National Basketball Association records as Warriors thump Nets
But the manager believes his team have been hindered by a series of hard back-to-back away fixtures, citing the fact they must travel to Manchester City in the Premier League on November 11, four days after a Champions League trip to Juventus, and that they visit Liverpool in December after a European away game against Valencia.