Derby County are welcoming Bulgaria Under-21 internationals Ivelin Popov and Ivan Ivanov for trials this week.

Popov, a 20-year-old right-sided player or striker, plays for Litex Lovech. He is the Bulgarian Under-21 captain and has won two full caps for his country.

Ivanov, who plays for Lokomotiv Plovdiv, is a 19-year-old defender.