Celtic will be in line to bank a significant windfall if Virgil van Dijk heads away from Southampton this season.

The Dutch defender has attracted the attention of Manchester United, Liverpool and Everton as a bidding way prepares to get underway for the 25-year-old.

Celtic banked nearly £13m when van Dijk made the move to St Marys in 2015 but a sell-on clause, believed to be 10%, will be invoked if and when he switches to another Premiership side.

The player signed a six-year deal with Southampton recently and the club have recently insisted that they will hold out for a whopping £50m for the van Dijk, a sum which would net Celtic a healthy profit.

Read more: Matt Le Tissier on Virgil van Dijk, Celtic's latest gem to shine at Southampton

Meanwhile, Celtic winger Stuart Armstrong is relishing his position at the heart of the Hoops midfield in recent weeks.

The former Dundee United player has had to be patient in an attempt to get into the side but has come to the fore in recent weeks, with the experience of the earlier weeks of the campaign offering him an appreciation of his current role.

“It’s a big thing for me to be involved and feel at the heart of it,” said Armstrong. “Even at the start of the season, I was out.

“I’ve had a good run in the team now in a central position, which I love, and I really feel part of this team.

Read more: Matt Le Tissier on Virgil van Dijk, Celtic's latest gem to shine at Southampton

“It’s nice to be a part of things when we are winning and doing well. It’s so enjoyable.”

He did admit, however, that his winner’s medal from Sunday’s Betfred League Cup win over Aberdeen ought to have been supplemented with a goal in the 3-0 win.

“I should have scored,” he smiled. “Obviously, I had a lot of time and I took an extra touch. It was a split-second decision with someone rushing at me and I tried to tuck it into the opposite corner.

“It went wide and it would have been nice to add a goal, but it was about winning the cup and I was just happy to end the day with a winners medal in my pocket.”

Read more: Matt Le Tissier on Virgil van Dijk, Celtic's latest gem to shine at Southampton

And Armstrong believes that Celtic’s current stranglehold domestically comes down to the manner in which Brendan Rodgers has imbued confidence throughout the Parkhead side.

“I think he saw that through in terms of believing in us and we believe in him, so everyone is happy,” he said. “Everyone has got great faith in him and everyone believes in him, while he believes in us.

“The way he wants to play, we are trying to achieve that and we are working really hard on and off

the field to make that happen.”