The Lakers’ second unit took a hit when the team announced during tonight’s 97-92 victory over the Cleveland Cavaliers that backup point guard Steve Blake would be sidelined for about three to four weeks because of a costochaondral fracture.

In layman’s terms, he fractured the cartilage that connects the ribs to the sternum.

Blake was originally hurt in Tuesday victory over the Phoenix Suns and then he aggravated it in the second half of Wednesday’s victory over the Utah Jazz. He is averaging 7.3 points, 1.9 rebounds and 2.8 assists.

Playing without Blake and Metta World Peace, who had a sore back and Achilles’ tendon, the Lakers’ backups combined for only four points tonight. Rookie guard Darius Morris, who figures to fill in for Blake, had three points in only his second NBA game.