BEREA, Ohio (AP) Browns coach Mike Pettine says the team did not understand the depths of Johnny Manziel's problems before they drafted the quarterback last season.

Manziel has been plagued by off-field issues since his arrival in Cleveland. He entered the NFL with a reputation for partying and the 2012 Heisman Trophy winner spent more than 70 days in a rehab facility last winter for an unspecified condition.

The team did its usual background check on Manziel, but Pettine says the Browns didn't anticipate ''how deep-rooted'' the QB's problems were.

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Pettine says he's taking a ''show me, don't tell me'' approach with the 23-year-old Manziel, who will start Sunday against San Francisco after being benched two games for breaking his promise to not be a distraction during the team's bye week.

Pettine says the ''repercussions would be harsh'' if Manziel has another misstep.

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