Brighton have submitted an official offer for Celtic midfielder Matt O'Riley.
Nothing has been agreed but the clubs are in talks which are set to continue over the coming days.
Celtic have rejected five bids from Atalanta for the Denmark international this summer, with the latest offer being £21.5m, plus add-ons.
It remains to be seen if the Serie A club will come back in for O'Riley after they signed Lazar Samardzic, with Chelsea among a number of other clubs interested in him.
O'Riley, who scored 19 goals with 18 assists in 49 appearances for Brendan Rodgers' side last season, set up the second of Celtic's goals in their 4-0 win against Kilmarnock in their Scottish Premiership opener.
TrendingThe 23-year-old is under contract at Celtic until 2027, with the club knocking back an offer of £20m from Atletico Madrid in January.
Rodgers has previously warned clubs that O'Riley will not be leaving Celtic on the cheap this summer:
"There are obviously bids that will come in for Matt O'Riley but, I repeat, there is no need for us to sell and we don't want to sell," he told News.
"If there's an offer that comes in that fits the valuation of the player then that's a different matter.
"Until that moment I'm fairly relaxed because he's training really well, working really hard and until that changes we just continue focused on performing.
"The challenge for teams coming to a club like Celtic is they sometimes can place their value on the league and not the player.
"What's important for me is if a player does leave here, they pay the value for the player and that isn't something that always happens.
"No player will leave here unless it's for the right valuation and at this moment in time there's been no team that's been anywhere near that."