UPDATED 01/06/12 9:29 a.m.

CHICAGO (CBS) — WBBM Newsradio has learned that Chicago Cubs shortstop Starlin Castro has been accused of sexually assaulting a woman after a night of drinking last fall.

As WBBM Newsradio’s Mike Krauser reports exclusively, the alleged victim is a Chicago woman in her 20s. No criminal charges have been filed, but Castro is reportedly wanted for questioning by Chicago Police.

LISTEN: WBBM Newsradio’s Mike Krauser reports

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She claims that she was drinking with friends at a River North nightclub on the night of Sept. 29 when she met Castro.

Sources say she and a friend left the bar at 3 a.m. and went to the 21-year-old Castro’s apartment on State Street nearby.

According to the police report, the alleged victim said she blacked out.

She told police she came to, and found the alleged offender – Castro, according to our sources – sexually assaulting her.

The heavily redacted police report offers little information.

It says that when she woke up she screamed and yelled at her alleged attacker, and left the apartment at about 5:30 a.m. getting a ride home from her friend.

It would be 12 hours before the alleged victim would go to a hospital, and police would become involved.

By then, it is believed that Castro was on a plane, heading home to the Dominican Republic for the off-season.

WBBM Newsradio’s sources do not believe Castro has been interviewed in person by police, having been out of the country since the day of the alleged rape.

Castro’s attorneys, Jay K. Reisinger and Michael P. Gillespie, issued the following statement on behalf of their client:

We are aware of certain allegations that have been made against our client, Starlin Castro. We have thoroughly investigated this matter, and we are confident that these allegations are baseless. Given the sensitive nature of this matter, we cannot comment any further.

Castro’s agent, Paul Kinzer, asked whether he’s discussed the allegations with his client, said, “Yeah, we have no comment on that.”

A detective assigned to the case said, “I can’t talk about that.”

The Cubs released the following statement in response to the allegations:

“We are aware that a police report was filed regarding an incident involving Starlin, but we have received limited information. While this is something we take very seriously, there is not enough information to make any further comment or take action at this time. We are hopeful when the facts are brought to light, Starlin will be cleared of any wrongdoing.”