Clark made the revelation during an appearance Wednesday on SportsCenter.
Clark, who turns 35 this fall, spent the first two seasons of his 12-year career with the New York Giants, then played for Washington in 2004 and 2005. Washington allowed him to depart via free agency in 2006, and he has spent the past eight seasons with the Steelers, helping them win Super Bowl XLIII in 2009 and earning Pro Bowl honors in 2011.
The free safety made 104 tackles and two interceptions last season.
Washington needs help at safety after the contracts of Brandon Meriweather and Reed Doughty both expired this offseason. The Redskins declined to engage in bidding wars for Jairus Byrd, T.J. Ward and Mike Mitchell — the top safeties on the market.
Have a Redskins question? E-mail Mike Jones at firstname.lastname@example.org with the subject line “Mailbag question” for him to answer it in The Mailbag on Tuesdays.
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