Seattle Seahawks wide receiver Percy Harvin, who suffered a concussion in Saturday's playoff win, won't know until at least Wednesday on his playing status for this week, coach Pete Carroll said.
Harvin must go through the NFL's mandatory concussion protocol.
Harvin suffered a concussion late in the first half of Saturday's 23-15 NFC divisional playoff victory over the New Orleans Saints.
"We (are) fortunate that we got the extra day," Carroll said Monday on his 710 ESPN Seattle radio show. "That really helps in these kinds of situations. We'll just see how he does. We won't know until Wednesday or Thursday until after all the tests are run."
The Seahawks will host the San Francisco 49ers in Sunday's NFC Championship Game.
Harvin tried to make a leaping catch in the end zone late in the first half Saturday before falling backward and hitting his head on the turf.
Harvin had major hip surgery on Aug. 1 to repair a torn labrum and was playing in only his second game of the season and his first since Nov. 17 against Minnesota.
Harvin caught three passes for 21 yards in the first half Saturday and had one carry on an end-around for 9 yards.
"The poor kid. He finally gets to play, and he banged his head against the turf really hard," Carroll said. "He was OK the first time, but the second one really rocked him.
"He was battling, did a good job and gave us a little spark. I think he had three catches and a run, which were nice plays for him in this first outing, and hopefully he'll be able to make it back for next week."