The Bundesliga giants are ready to let the Ghana midfielder leave this summer.
Lambert could sign the 26-year-old for just £2.5million.
The highly-rated midfielder has also been linked with a return to former club Rosenborg in recent weeks.
The Bundesliga giants are ready to let the Ghana midfielder leave this summer.
Lambert could sign the 26-year-old for just £2.5million.
The highly-rated midfielder has also been linked with a return to former club Rosenborg in recent weeks.
