Norwich City said it has spoken to player Brandon Williams over claims he had been followed after a home game.
The full-back was in the team that lost 4-0 to West Ham United on Sunday.
He later posted a photo to his one million followers on Instagram of his dog with the words: "For the people that followed me, he's always awake", and a stream of laughing face emojis.
The club said it had spoken to Williams and was assured the matter was not a cause for concern in terms of safety.
The 21-year-old had also posted a photo of a raised middle finger with the caption "What a beautiful day.