There does seem to be a lot of thought put into formations and such, 352?, or some other. However I have the answer, truly I do, and it's so simple (and I hate to show off), but the 4 up front is a no brainer.
Line up with
Left forward Greg T, Jullien Right CF, Bitton Left CF, Ajer Right forward.
A traditional midfield with Turnbull, Christie, Mo Elyounoussi and Rogic .
a back two of Griff and Eddie.
So Celtic line up with proven goal scorers like Ajer and Jullien in 244 (leaked) and a mind fuck for Gerard to contemplate,
then 2 minutes after KO Celtic revert to the actual 442,
and while Beale is still trying to answer his pupil's questions.
Stevie has a Brain fart,