The powerful 21-year-old forward netted a dramatic winner for the Danish side against Manchester United last week in Europa League action, further building on the impressive reputation he has carved out with the Superliga giants.
And reports claim that his performances have alerted a host of clubs, with Chelsea, Southampton, Aston Villa and Leicester interested in the Nigerian, who has been scouted this season.
The 6ft. 7” striker is known for his physically imposing style and has netted eight goals in his 49 appearances for FC Midtjylland, despite his young age.
Onuachu came on as a late sub against United last Thursday and fired an accurate strike past Sergio Romero with around 15 minutes to play to hand his side a 2-1 aggregate lead in their last 32 tie ahead of the return leg at Old Trafford.