Groin/abductor injury is very tricky and can take a long time to heal, again it was what ailed Kaka and Robben for a long time. They'd better take this very seriously, otherwise there will be relapses, guaranteed.
On the other hand, we need to learn to play without Messi. Today's game felt completely different after Messi was subbed off, as if we didn't know how to play any more. Neymar and Suarez need to step up and lead. Even if he is only out for the next three games, all three are tricky, especially the one against Gladbach and Celta. We can't afford to lose more points.
the team does know how to play without messi, suarez and neymar and co were destroying everyone last year including real without him. the tricky situation arises when he is subbed out of a game, the team can't immediately adjust to cover for the influence messi normally has on games.
I think we always play as a team when Messi is absent, but when he plays we become automatically Messi-dependent.
Messi not tracking back disbalance our midfield because they have to move away from their initial position to fill the gap, while when he's absent everybody maintain their position without problems .. and we press as a mass.
I get that you dislike him but we play better with him in our team than without him. That's clear as day for everyone to see.