To be honest, Atletico Madrid's performance in La Liga this season is quite good because so far they have only lost 2 times while Madrid has lost 4 times and Barcelona has lost 5 times, so it is not without reason that he said that Atletico Madrid has a big chance of winning La Liga this season, but keep in mind that on matchday 28 Atletico Madrid will face Barcelona and this match will be a very exciting match because Atletico will be the host, if Atletico can beat Barcelona there, then Atletico Madrid's points will be more than Barcelona and their chances of becoming champions are very big as long as they can maintain consistency in their performance.
In fact, that match is gonna be one of the decisive match for La Liga trophy race this season because whomever that succeeded in winning that game has gained much advantage of lifting the La Liga tittle, as it will be remaining only few games to the end of the season's competition. It definitely gonna be a tough game to watch, and most likely might end in a draw, because no side would want to lose in that critical time of the season, as a lost in that match can render all efforts since the beginning of the season worthless.
We cannot say right now how important the match will be for either team. We can say that the match will definitely be exciting and important for both teams. Before the Barcelona vs Atletico Madrid match, they will play one more match each where Barcelona will face Osasuna and Atletico Madrid will face Getafe. Osasuna and Getafe are definitely strong teams, but their recent form is not good at all. If Barcelona and Atletico Madrid can win the match then Barcelona vs Atletico match will be a decisive match, if Atletico Madrid loses against Getafe then they will play against Barcelona to reduce the points gap. This match on the 17th will make La Liga more competitive especially among the top teams.