"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.
This statement comes after police said they were investigating an allegation of sexual assault involving the star wide receiver. Officials say the alleged incident happened early last Sunday morning in a San Francisco hotel just a few hours after the 49ers playoff game against Green Bay.
Police say Crabtree has not been detained or arrested and has agreed to be available for more questions in the future.
"Our investigators from the Special Victim's Unit is handling the case," said SF police spokesperson Gordon Shyy. "Michael Crabtree has been interviewed with his lawyer and is very cooperative with our investigation."
When the investigation is done, police say the findings will be forwarded to the district attorney's office, which decides if charges should be filed.
It's bad timing for this bomb shell. Crabtree is in Atlanta with the team for Sunday's NFC championship game against the Falcons. The winner goes to the Super Bowl.
49ers General Manager Trent Baalke issued a statement late Friday evening saying, "We are aware of the allegation against Michael and understand that he has fully cooperated with authorities. The 49ers take such matters very seriously. We will have no further comment at this time as the legal process is ongoing. Additional requests for comment should be directed to Michael's attorney."
For fans who are gearing up for a Sunday showdown in Atlanta, this allegation is surprising.
"Obviously it's news to me at this point, so it's a bit of a shock," said 49ers fan Kyle Naganuma.
Fellow fan Kathie Dyer adds, "I don't understand why these guys who have it so good, and are such big in the news right now would do something, why he would do something that could potentially hurt not only himself, his family, but the team."
Meanwhile, 49ers fan Ernesto Cruz defended Crabtree, "As a fan, I'm gonna back him up till it all comes true. But right now, it sounds fake."
(The Associated Press contributed to this story)