Due to personal reasons though which has been accepted by the club.
Personal reasons that the players may have asked to keep secret and Brendan has obliged.
If what @Abrasive fox says is true (and I see no reason why he'd lie or make it up) that one of the players in question wife is heavily pregnant then I can totally understand why he may have been late to training.
I think, as is normal now with any club or manager and their press conferences, things will get blown out of proportion. Stringer going on his gut instinct and making Rodgers out to be a bad person for 'choosing' to keep it secret doesn't help the situation. I get the holding to account stuff but it seems they (journalists/reporters) become blinded by their own egos and lose sight of what's going on. Too eager to create something out of nothing and it leads to situations like we have here in this thread and negative publicity.