Celtic midfielder Matt O'Riley has been signed by Brighton for a reported fee of PS25m plus add-ons.

The 23-year-old Danish international has waved goodbye to the Hoops after signing a five-year contract until June 2029.

O'Riley, born in London and who also plays for Denmark national team, scored 27 goals in 124 appearances for Celtic, winning six trophies including three Scottish Premiership titles.

In an interview on Brighton's website, he said "I'm very, very happy.

"It got a little bit stressful over the last couple of weeks, if I'm being honest, because I think the talks were ongoing for a good couple of months but I'm just really happy to be here now."

On leaving Celtic, O'Riley added: "It is hard. People probably don't realise how big the club is until you get up there. It's a real family club and one that I was made to feel welcome at very early on.

"It's a very unique place just in terms of the passion the fans had, [it] is something I had never experienced before. I thoroughly enjoyed my time there.

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"It is still a little bit emotional speaking about it because I had such good memories there, but it just felt like the right time for a new challenge for me."

Brighton manager Fabian Hurzeler said: "He plays a very specialist position; he is very good at occupying and attacking the right space. He likes making deep runs, and knows when to attack at the right time.

"He enjoys getting forward and attacking the opponent's penalty area, but he also has a good defensive instinct. That balance makes him special. He is a great character, and has a good ambition to succeed and that's something which is very important for us."