The proposed investment comes during a challenging period for the Cobblers following their relegation to League Two. The club suffered a difficult campaign, finishing bottom of League One last season before reporting pre-tax losses just short of £3m.
Thomas previously confirmed that the incoming investment would wipe out existing debt and provide solid financial foundations.
Former Villarreal, Sao Paulo, Corinthians, and Orlando City forward Pato, 37, retired from playing last year and now transitions into club ownership alongside his corporate partners.