The 6-foot-11 forward felt dizzy Wednesday night during the Sonics' 114-110 overtime victory over the Los Angeles Clippers. He was hospitalized after the game.
Baker has no history of heart problems. He was examined by cardiologists at the hospital and given permission to return to the Sonics.
Baker joined the Sonics in San Francisco. He did not practice Thursday.
Baker was expected to play Friday night against the Golden State Warriors in Oakland.
"There's no reason to think he won't play," team spokeswoman Robyn Jamilosa said.
Baker scored 17 of his 18 points during the second quarter of Wednesday night's game. He left with 5:21 to play in the fourth quarter and did not return.
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