"We don't know what can happen from now to July, so what I've been able to do this whole season to this point is just worry about what's at hand and that's winning another championship," James said.
James can opt out of his 2010 deal after this season, after next season or become a free agent in 2016. He left the Cleveland Cavaliers in a 2010 announcement on national television - setting off a firestorm of controversy.
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The Chicago Bulls have signed free agent forward Jarvis Varnado to a 10-day contract.
Varnado is currently in his second year in the NBA. After being drafted by the Miami Heat in the second round of the 2010 NBA Draft, Varnado played overseas for two seasons.
During the 2012-13 season, Varnado played for the Miami Heat, Boston Celtics and Sioux Falls Skyforce of the NBA Development League. This season, he has started 22 games for the Iowa Energy of the D-League and has averaged 14.1 points, 11.0 rebounds and 4.68 blocks.