Bruno Fernandes gave Man United fans a scare when he limped out of their 4-0 victory over Everton before being spotted wearing an ice pack.
The Man United captain set up two goals in the romp to overtake Man City's Bernardo Silva and register the most Premier League assists (46) for a Portuguese.
It looked like a perfect afternoon for Man United as both Marcus Rashford and Joshua Zirkzee both scored twice to give manager Ruben Amorim his first Premier League victory.
The three points lift Man United to ninth and only four points off fourth place in a congested Premier League table.
Amorim's side have picked up momentum with two successive victories and Fernandes has been back to his best after a slow start to the season.
But Fernandes' afternoon ended prematurely when he was taken off for Alejandro Garnacho in the 66th minute. And the 30-year-old was then pictured with an ice pack strapped to his ankle.
With a gap of just three days until a daunting trip to Arsenal on Wednesday, the sight would have been a worry to Amorim who will be desperate to have his captain - and most creative player - available.
The Gunners sit in second place and looked in prime form themselves after putting West Ham to the sword 5-2 on Saturday.
So, it would have been some relief to Amorim to see his captain was at least able to join his team-mates on the pitch after the game to salute the home fans at Old Trafford.