With veteran duo LeBron James and Rajon Rondo out injured, Luke Walton has urged other Los Angeles Lakers players to fill the leadership void. The Lakers went down 119-112 to the New York Knicks at Staples Center on Friday, their fourth loss in five matches since James sustained a groin strain against the Golden State Warriors. James will miss the Lakers' next two games and be reassessed next week, while Rondo is not expected to be back until February after having surgery on his finger.