The woman, who told police she's previously had a sexual relationship with the star quarterback, said she met the players April 1 at an apartment where they were mixing drinks and watching a basketball game.
She told police the players told her that in order to have a drink she had to "hit the bong which contained marijuana."
The woman reported she felt lightheaded and went to the bedroom to lie down, and that Kaepernick followed her in, kissing and undressing her before leaving the room.
She told police that after Kaepernick left the room, the other two players opened the door.
The woman said she next recalls waking up in the hospital the next day with no memory of how she got there, authorities said.
While no charges have been filed, Miami Police Chief Manuel Orosa told the Miami Herald "there was an incident and we are investigating."
Lockette's team issued a statement Thursday.
"We are aware of the situation, monitoring it closely and will not have any further comment at this time," said a Seahawks spokesman.
The woman made the allegations to Miami police the evening of April 3.