Chelsea scouts have looked at Porto’s promising Ruben Neves but Grujic is also very much on their list hoping to do the magic they need.
Grujic was a member of the victorious Serbia Under 20 World Cup winning side last summer.
Chelsea scouts watched him last weekend in their 3-1 derby win over Partizan and he continues to impress.
Grujic, 19, has progressed through Red Star’s youth academy and made his debut in 2013.
He stands at 6ft 3ins tall and is a Defensive Midfielder, he similarly plays like Paul Pogba although Paul Pogba remains Chelsea’s ultimate transfer target.