Manchester United forward, Cristiano Ronaldo is not convinced by the methods of interim boss, Ralf Rangnick, according to Spanish publication Mundo Deportivo.
The 36-year-old showed visible signs of frustrations during their 1-1 draw with Newcastle on Monday night.
Ronaldo was deployed as one of two central strikers against the Magpies, starting alongside Mason Greenwood, who was replaced by Edinson Cavani at half time.
He was spotted throwing his arms up on several occasions and generally looked perturbed with his teammates after another limp display.
It is understood Ronaldo is not happy in his second spell at Old Trafford, with major concerns over the team’s performance in the Premier League.
The Portugal captain is also unimpressed with Rangnick’s methods on the training ground, despite him only being in the job for a month.
United are already 19 points behind near rivals and league leaders Manchester City, although they do have two games in hand.
They now face a major battle to secure a top-four finish and Champions League football next season.