Chicago Cubs All-Star shortstop Starlin Castro was questioned by Chicago police Thursday night and into Friday morning over allegations of sexual assault, according to WBBM Newsradio in Chicago.

A woman accused Castro, 21, of sexual assault last fall, but no charges have been filed and Castro's representatives deny the allegation.

When reached by ESPNChicago.com, Chicago police spokesman Robert Perez would not confirm that Castro had been interviewed, per department policy, but he did say that "he's not under arrest."

Castro returned to Chicago on Wednesday for the first time since the season ended on Sept. 30, according to WBBM. He is expected to attend the Cubs Convention later Friday at the Chicago Hilton and Towers.

WBBM reported that the unidentified woman, who is in her 20s, was at a River North nightclub Sept. 29 when she met Castro. After 3 a.m. CT, she went with a friend to his apartment, where she alleges that the assault took place.

The woman went to a hospital the next evening and police became involved, while Castro left for his offseason in the Dominican Republic, according to the report.