But Sanchez picked up a hamstring strain during the week and is now a doubt for the resumption of the club 's domestic league campaign .
Sanchez is arsenal 's top scorer this season with 10 goals in all competitions .
But Sanchez , Arsenal 's top scorer this season with 10 goals in all competitions , picked up a hamstring strain during the week and is now a doubt for the resumption of the club 's domestic league campaign .