Roy Keane has warned Manchester United that Cristiano Ronaldo should not mean all the club's long-standing issues are not ironed out.
According to Keane's view, Ronaldo is a generational talent but it does not translate that the rest of the players should just add numbers.
"Manchester United need to be careful," Keane told Sky Sports.
"Just because Ronaldo has come to the club, everyone thinks everything is just going to fall into place. No, the players still need to step it up. But Ronaldo is still a world-class player.
"Anything in the box, he [Ronaldo] is the best in the world," Keane added.
The Irish international then used the shock 2-1 loss to Young Boys in Switzerland as a case in point when Ronaldo is not dominating a game.
"It was no surprise when he produced last week [against Newcastle]. But in midweek [against Young Boys], he struggled upfront without decent support," Keane concluded.
Meanwhile, Ronaldo is most likely to take a breather and watch from home when United do EFL Cup duty against West Ham midweek.