Jeremy Jackson, 34, was removed after contestant Chloe Goodman said he opened her dressing gown, exposing her breast.
Hertfordshire Police said it was aware of events on the Channel 5 show in the early hours of January 10.
Ken Morley was also removed, following complaints to the UK’s Ofcom about the use of racist language.
Channel 5 said the former Coronation Street star was taken out of the house for using “unacceptable and offensive language”.
Hertfordshire Police said officers were working with the show’s producers to investigate the circumstances of the incident involving Jackson.
Trouble started on the show, filmed at studios in Borehamwood, Hertfordshire, when Jeremy Jackson got drunk and vomited in the toilet.
He was being comforted by model Chloe Goodman, who told other housemates: “I was helping him and he went to my dressing gown top and put my boob out.”
Jeremy Jackson later apologized, insisting he had not ripped open the robe in an aggressive way but said: “I accept all the ramifications.”
Producers decided to remove the actor from the show, calling his behavior “wholly unacceptable”.
Cameras do not film in the toilet of the Big Brother house, but the aftermath of the row was shown in Saturday night’s episode.
It showed a tearful Chloe Goodman being comforted in the Big Brother diary room by fellow housemate Nadia Sawalha.
Later, Jeremy Jackson was called to the diary room to be told he would be leaving the show.
A police spokesman said: “We are currently working with the program’s producers as part of our inquiries.”
“It would be inappropriate to comment any further at this time.”
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