The billionaire Issa brothers and new owners of Asda have reportedly become the largest outside investors of sportswear brand Castore.
It comes amid plans for the clothing firm to relocate its headquarters from Liverpool to Manchester, creating 300 jobs in the process.
Reports also suggest Castore will open five new stores over the next six months.
Mohsin and Zuber Issa, from Blackburn in Lancashire, are understood to have first invested in Castore in March last year through their Jersey-based Monte Group, according to The Times.
Castore, which has a brand partnership with Andy Murray and a kit deal with new Scottish Premiership champions Rangers, was founded in 2015 by brothers Thomas and Philip Beahon.
It now sells products in more than 50 countries worldwide and its revenue is expected to reach £100million this year.
The company currently has retail stores on the King's Road in London and within the Liverpool ONE scheme in the city centre.
The news of the Issa brothers reported investment in Castore comes after the billionaire siblings were told to close 27 petrol stations to complete their Asda takeover.
The competition watchdog said the Issa brothers - which own the Euro Garages business - would have close part of their network for the transaction to be reconsidered.
The CMA first launched an investigation into the £6.8billion Asda takeover in December, after the deal was given the go-ahead by Walmart.
Under the new ownership, the self-made billionaires will join TDR to acquire a majority stake in Britain's big four grocer.
Bosses previously said the sale will include a £1billion cash injection for Asda, a greater focus on British produce and a long-term pledge to deliver more "competitive prices" for fuel customers.
EG Group declined to comment when approached by The Mirror.
