Arsenal have made formal contact with Chelsea over signing winger Noni Madueke.
BBC Sport reported that the Gunners had already agreed personal terms with Madueke last week ahead of any potential move, but they have now made an official approach.
It is understood Chelsea are looking for a fee in the region of £50m for the 23-year-old England international.
Madueke is currently part of Chelsea's squad at the Club World Cup and came on as a substitute as the Blues reached the final of the competition after beating Brazilian side Fluminense 2-0.