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Lallana signed for the Seagulls in the summer of 2020, committing his future to the club until 2023 after departing Premier League champions Liverpool.
An attacking midfielder, but capable of playing anywhere across the middle of the park, the 32-year-old began his career down the coast at Southampton.
He made his debut for the Saints in August 2006, before having a brief loan spell at Bournemouth.
The England international would go onto become a regular for Southampton, helping them to back-to-back promotions from League One to the Premier League.
He would be appointed captain at St Mary’s in 2012 and then made his England debut in November 2013, before going onto be shortlisted for the PFA Player of the Year and making the Team of the Year less than 12 months later.
It was that impressive campaign that led to Brendan Rogers taking Lallana to Liverpool in a £25 million move.
It proved to be a hugely successful move for him, as he would go onto win the Champions League, Premier League, UEFA Super Cup and Club World Cup, as well as finishing runners-up in the Europa League and League Cup in a six-year spell on Merseyside.
He called time on his Reds career in 2020, signing for the Albion in July.
Potter: Lallana has been useful in Liverpool build-up
After six years at Anfield, Albion midfielder knows all about today's Amex opponents.
Lallana makes us a better team, says Gross
The German has been delighted with the impact of his fellow midfielder.
Lallana: Being a top trainer is key to longevity
Midfielder hungry to keep giving his best for Albion.
Lallana and Williams named AITC ambassadors
Both Lallana and Williams are delighted with their new roles as part of Albion in the Community.
Tough moments have moulded me, says Lallana
Albion midfielder reflects on a career of highs and lows.