Doncaster boss Sean O'Driscoll has confirmed he will leave no stone unturned in his search for defensive reinforcements.
O'Driscoll is trying to strengthen his squad for an assault on the Championship after allowing Graeme Lee and Steve Roberts to move on this summer.
He told the BBC: "Polish, Lithuanian, Russian, German and Spanish, there are a lot of defenders available.
"Whether they are any good is a different story, but we will have a look at a few in pre-season."