Rangers may have a real chance of signing Benfica left back David Jurasek with the Czech international is allegedly keen on a move to Ibrox. Rangers have been linked with so many left backs of late, it’s almost difficult to keep up. Eredivisie left backs Gijs Smal and Fredrik Oppegard have been mentioned, as has Bristol City ace Cameron Pring. Kai Wagner has chosen to stay at Philadelphia Union, so that’s one rumoured target out of contention. Then there is Benfica ace David Jurasek with reports indicating that Rangers are battling Bundesliga clubs in the race to sign Jurasek. David Jurasek op…