Entry #1 at Monza for the Italian GP at Monza on 19 October 1924 was an Alfa Romeo P2 driven by WINNER Antonio Ascari. Captions says: Gildo Strazza, Antonio Ascari (standing), Vittorio Jano, Luigi Bazzi, Giorgio Rimini. Not sure if these are in this picture and in which order. Ascari is for sure the one standing.  Vittorio Jano may be the one with black suit and moustache (second from left). And Luigi Bazzi the mechanic on the far left (white overall), as he has been identified such in a different picture.
Unknown photographer
<a rel="nofollow" class="external autonumber" href="http://s3-eu-west-1.amazonaws.com/psi-dotcom-prd/fondazionepirelli/wp-content/uploads/2018/09/06111420/1_2_60_1924-1925_Strazza_Antonio-Ascari-Jano-Bazzi-Rimini_Alfa-Romeo.jpg">[1]</a>