For the upcoming games of Real Madrid, Barcelona and Atletico Madrid I can say that I'm confident about the first and last one to win. However I'm not confident about Barcelona as much as them in their next game. Because it is an away game against Vallecano. Barcelona lost to them 3 times and got a draw in their last 4 head-to-head games in the La Liga.
Vallecano are holding a psychological advantage in hand because of that. In addition to that Real Madrid couldn't do better than drawing with Vallecano not long ago as well. Combining all of this it seems a little risky to bet on Barcelona here.

I don't think Barcelona will lose against Vallecano because Barcelona will not like to lose any match if they mistakenly draw or lose against Vallecano, Athletico Madrid we lead them on the table because I am very confident Athletico Madrid will defeat Mallorca and Cadiz will be very easy for Real Madrid to win the match because they are not in good form but since Real Madrid players are injured I think he can affect them in the match but he will be very difficult for Real Madrid to lose, If you want to bet against Barcelona the best idea is to play it as a win or draw because Barcelona will not lose that match, The best thing is to split the points.
Although, in the last two seasons in fact Rayo Vallecano managed to beat Barcelona and or, Rayo Vallecano managed not to lose by Barcelona for home and away in the last two seasons. But ya, if we consider this season, the fact is that Rayo Vallecano does not have good results for home matches. Because of Rayo Vallecano 6 home matches so far this season, the truth is that Rayo Vallecano has only 1 win, 3 draws and 2 losses. With such results, then of course Barcelona will still have a chance to win in the away match against Rayo Vallecano this time. Anyway, basically Real Madrid, Barcelona and Atletico will play against mediocre teams in the next match and thus, the three teams can still guarantee win result in the next match in La Liga.
Xavi will have to be careful against Rayo Vallecano. Barcelona team has not won against Rayo Vallecano in the last two matches. Barcelona's past record against Rayo Vallecano is not very favorable. Barcelona have won only two of their last five matches against Rayo Vallecano.
Rayo Vallecano is not doing well this season. And the team is even weaker in home matches. The team has won only one match in 6 home matches. Even so, it won't be easy for Barcelona to beat Rayo Vallecano. Xavi will have to take advantage of Rayo Vallecano's weak defense. And according to this, Xavi has to make match strategy. If Lewandowski, Gundogan and Raphinha do not perform well in this match, Barcelona will not be able to get 3 points against Rayo Vallecano.