The 21-year-old has linked up with Keith Andrews's squad during pre-season after a productive rise through Brentford's academy pathway. A product of Simoiben Football Academy in his hometown of Kaduna, Fredrick spent the 2021/22 season at Abubakar Bukola Saraki FC before moving to Nasarawa United, where he played at both centre-back and right-back.
He joined Brentford B on loan in August 2023, impressing enough under Neil MacFarlane to earn a permanent move in April 2024, before helping the Under-21s win the Professional Development League title and reach the Premier League Cup final in 2024/25.
Andrews explained the thinking behind the new deal: "We're delighted that Benji has signed a new deal and is going to be part of the group this season, because we see a lot of potential in him and where we can bring his game to.
"He's already played senior international football and was a big part of Nigeria's team in their World Cup qualifying campaign. Last season, he had a really productive loan in Belgium that was unfortunately cut short due to injury. The first port of call for Benji is to integrate into the squad consistently.
"His last game was the middle of November, so that's a long time he's had out through injury. He's then got to come into the first-team space, challenge his team-mates and show the ability and the personality which I know he has."
Brentford B team head coach Sam Saunders added: "Benji has been an absolute pleasure to have ever since he came through to the B team. I'm really, really proud of his progression and the levels he's gone up in his time at Brentford. He's an amazing character, a really likeable lad, very coachable, a top guy who is such a brave young player at such a young age."
Fredrick made his senior Nigeria debut in May 2025 and started the closing matches of the country's 2026 World Cup qualifying campaign.
"It's a great feeling. I'm happy and proud of myself, and my family are proud of me as well," he said. "My aim is to make my debut with the first team, get Premier League minutes and give my best when I have the opportunity."