McDonnell noted the poor performances of a number of players, but highlighted the two star signings of Mourinho's time in charge, Alexis Sanchez and Paul Pogba, as players who have failed to reach the level they were at before signing for their current manager.
But Mourinho insists he will not be so much rotating against Eddie Howe's side as he will be looking for better options ahead of the semi-final against Tottenham on Saturday.
"Everything was complicated. So we were losing lots of balls, so by losing lots of balls, with turns and flicks and tricks, the midfield players and central defenders are at risk of one touch, one late challenge and they are out".
An irked Mourinho had said following defeat to the Baggies: "Rotating is not the right word - if I play a player against Bournemouth and the player is phenomenal, he plays the semi-final".
"No one's denying that he's been a very good manager, but people are living in the here and now, things are evolving, and that team isn't evolving in a way that makes you think next year is going to be there year".
"So the word is not rotation - it is an opportunity for people, for some people to play and to try to get a place in the team for Spurs, and some of the guys who played [against West Brom] don't have a place in that team [against Spurs]".
"But he's obviously improving; he's obviously getting more comfortable to play with the team, and I'm pretty sure that, next season, will be better". "Or do you want me to go for the price they cost, or their salary, or their attractive face or.the only way is to go with performance". "The only way is to go with performance". However, both underperformed against West Brom, with Pogba being hauled off after 57 minutes.
Specifically on Pogba, Neville accused the Frenchman of playing the game at walking pace in recent games.
Dan McDonnell, the Irish Independent's football correspondent, joined Ger in studio on OTB:AM this morning to discuss United's 1-0 loss at Old Trafford to bottom placed Premier League side West Brom.