Hasselbeck participated in just his second full practice since injuring his back nearly a month ago.
The Pro Bowl quarterback has played just two series of a preseason game since January's playoff loss at Green Bay.
Hasselbeck hurt his back following a practice shortly before the first preseason game Aug. 8 at Minnesota.
He said Monday he isn't anxious over how he will feel getting hit Sunday for the first time in almost nine months.
Hasselbeck made his third Pro Bowl last season while setting Seattle records for completions (352), attempts (562) and yards passing (3,966).
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