"Michael fully cooperated with the inspectors and will continue to do so throughout this investigation," the attorney, Joshua Bentley, said in a brief statement emailed to The Associated Press.
Bentley provided no additional details and had no further comment.
The statement comes after police said they were investigating a sexual assault allegation involving Crabtree in a San Francisco hotel early Sunday. Crabtree hasn't been detained or arrested, and has agreed to be available for more questions in the future, police said.
The probe is being handled by the department's special victims unit. When the investigation is done, the findings will be forwarded to the district attorney's office, which decides if charges should be filed, police said.
Authorities didn't release any further details.
49ers General Manager Trent Baalke said the team is aware of the allegations.
"The 49ers take such matters very seriously," he said in a statement. "We will have no further comment at this time as the legal process is ongoing."
San Francisco is preparing to play the Atlanta Falcons in the NFC championship game on Sunday. The winner goes to the Super Bowl.
The 49ers said Crabtree made the trip to Atlanta. The team referred all other questions about the matter to Crabtree's attorney.
This season, Crabtree became the first San Francisco wide receiver to log more than 1,000 yards in a season since Terrell Owens in 2003. He had a career-best 1,105 yards receiving, including a single-game high 172 yards on eight receptions in a win over Arizona.
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