Barnes questionable; Blake out

Matt Barnes, a backup forward, has a sore right knee and might not be able to play in tonight’s game against the San Antonio Spurs, the Lakers announced this afternoon. Barnes had surgery on his knee back in January. Steve Blake, a reserve guard, definitely won’t play tonight after coming down with chicken pox.The Lakers said he’s out indefinitely.

The Lakers plan to sign shooting guard Trey Johnson from the Bakersfield Jam of the D-League in order to bolster their playoff roster. Johnson was due to arrive at Staples Center during tonight’s game against the Spurs. He will sign Wednesday and be available to play in the regular-season finale against the Kings at Sacramento.