Representatives of the 19-year-old have met with officials of the Nigeria Football Federation and Lookman reportedly seems interested in switching allegiance to Nigeria.
England are however unhappy that the NFF have met up with close family members who are putting the lad under pressure to accept Nigeria.
The FA say it is a distraction and he should be allowed to focus on his club career.
Lookman has played for England at youth level.
Coach Gernot Rohr will meet with the player this week in London.