By Jude Summerfield Hansi Flick has a number of significant injury worries to concern himself with as Barcelona prepare to take on Osasuna on Saturday night. The German manager has enjoyed a largely successful start at Camp Nou but injuries have begun to pile up, meaning Flick has had to dip into the club’s crop of homegrown youngsters. However, Barca are dealing with the absences well, bouncing back from defeat in Monaco to defeat Villarreal and Getafe in La Liga. Barca lead Real Madrid at the top of the table by four points, but can they extend that advantage before Los Blancos battle Atleti…