Manchester United boss Ralf Rangnick cannot continue to play Marcus Rashford in his favoured 4-2-2-2 formation, according to former Red Devil Paul Parker.
The German took over at Old Trafford as interim manager following the departure of Ole Gunnar Solskjaer.
The 63-year-old will manage the club until the end of the season and has yet to taste defeat in the United dugout.
In his first game in charge, the Red Devils beat Crystal Palace 1-0 as the United boss opted to line up in a 4-2-2-2 formation, with Rashford partnering Cristiano Ronaldo up front and Jadon Sancho and Bruno Fernandes in behind.