If they find that they are violating the protocol on purpose they will be relegated to Serie B.
Even Napoli is still under investigation for a similar thing.
Anyway cases in players are decreasing over these weeks.
This is will be a serious mistake by Lazio if it happens. they just need to give real results about covid test, nothing more. If they are relegated because of data manipulation, this case will remembering us about Juventus case.
Just because they don't want to lose in a game because the best formation has broken by Covid, and being relegated, it will be better to lose on the match.