The 23-year-old was a virtual ever-present for the Seagulls last term, and completed a £50 million move to Arsenal last week.
But Albion coach Graham Potter is seemingly unflustered about losing the England international.
Speaking recently, he said: “I think we have got enough competition in that area. We have got enough good players. We can be flexible with how we set up.
“You can’t replace a £50 million player, you have to look to be creative with solutions within the squad. But we are in a good place now.
“We wish Ben well, he has been fantastic. His journey from the academy to Newport County, to Peterborough, to Leeds United is fantastic for him. To then get a move to Arsenal is a great achievement for him and the club.
“It is a proud moment for everyone connected with the club and I am really pleased for Ben. The fee gives us a fantastic opportunity to develop the club and progress the team."
Potter was speaking after Albion’s first win of pre-season, a 3-1 victory against Luton Town at Kenilworth Road where goals from Aaron Connolly, Enock Mwepu and Percy Tau sealed a 3-1 win.
“I thought we played well in the first half especially; we controlled the game, created some good chances and scored some good goals. I was really pleased for Enock [Mwepu] to get off the mark.”
We’ve gathered the best of today’s Premier League speculation below...

1. Villa join McNeil race
Aston Villa could be set to join Everton in the race to sign Burnley star Dwight McNeil, as Jack Grealish edges closer to joining Manchester City. McNeil is likely to command a significant transfer fee, after another impressive Premier League campaign last season. (Liverpool Echo) (Photo by Lewis Storey/Getty Images) Photo: Lewis Storey

2. Battle on for Daniliuc
West Ham United and Southampton have been tipped to go head to head in the race to sign OGC Nice defender Flavius Daniliuc. The Real Madrid youth academy product is currently the captain of Austria's U21 side. (Daily Mail) (Photo by DAMIEN MEYER/AFP via Getty Images) Photo: DAMIEN MEYER

3. Clarets join Hughes race
Burnley have joined the race to sign Watford midfielder Will Hughes, with Crystal Palace also eyeing up a move for the 26-year-old. (The Athletic) (Photo by Richard Heathcote/Getty Images) Photo: Richard Heathcote

4. Asensio in demand
Leeds are prepared to do battle with Everton and Leicester for Real Madrid outcast Marco Asensio. (Fichajes) (Photo by Koki Nagahama/Getty Images) Photo: Koki Nagahama