The rumours about "a Polish fighter" came from Polish journalist Mateusz Borek a couple of weeks ago
In his twitter account he just posted
" I see that the fight Wilder VS Wawrzyk 26.09 takes shape. It is not accidental tomorrow sparring at the Legion considered official fight."
Andrzej Wawrzyk signed Haymon as his co-promoter before he was involved in a bad car accident last year.
He's fighting a bum tomorrow, so Haymon may well try to have him ranked by the WBC
Szpilka is fighting Aug 14, so that should count him out