Forest chief executive Mark Arthur is quoted as saying: "We have received complaints from members of the public regarding the behaviour of a group of players in Nottingham city centre on Tuesday evening.
"We have launched an internal inquiry and will take appropriate action against the players concerned if we find they have a case to answer."
The story is being reported across the national media this morning just 24 hours before a weekend that could see Forest relegated to League One if results go against them.