It will take a minor miracle for them to stumble from here.
"We play against a team that is having a fantastic season and the game will be resolved, like every one we have played against them, by the small details".
With the likes of Fernando Torres, Kevin Gameiro, Angel Correa and Yannick Carrasco only ever performing in fits and starts, Griezmann was forced to bear the burden of carrying the forward line nearly alone for far too long.
Antoine Griezmann has been on fire in the past two games, having netted four goals against Leganes before bagging a hat-trick against Sevilla last weekend. But despite finally getting close to Barca's goal, Marc-Andre ter Stegen was rarely called into action.
Oblak parried away Sergio Busquets' first-time volley from a corner soon afterwards and with five minutes remaining Atleti were rightfully denied an equaliser by the offside flag, with Costa straying beyond the last defender in nodding down for substitute Kevin Gameiro to smash home.
Atletico are doing well now, but they have been doing well since the beginning of the season.
Simeone might be gunning for victory at the Nou Camp but was full of praise for the impact of his opposite number this season.
Suarez's goals have also helped - he's up to 20 in the league - and Coutinho showed signs of magic against Atletico, but Messi is still the man.
Simeone was pragmatic about his club's hopes of regularly upsetting the Barca-Real Madrid stronghold.
Griezmann has 12 goals in his last nine matches in all competitions.
However, the duo didn't get a look in during the first half.
Diego Simeone's side had won eight and drawn one of their previous nine in LaLiga, but their momentum was halted by another milestone moment for the majestic Messi.
What didn't change was Atletico's record against Barca. "But we go to Barcelona knowing that we will be facing the best team".