Simeone's main problem in the Champions League

Atletico Madrid drew on Friday at the Mestalla. They once again conceded two goals and again showed they are not as solid in defence as they were before. Now, 'Cholo' has an important weakness which was not there before, +

They had to take Renan Lodi out of left back early into the second half and Sime Vrsaljko came on for him. 

The Brazilian started very well in pre-season and in the early part of the season, but he is far away from the quality Atletico Madrid want and need. Right now, that left back position is weak. 

Renan Lodi was also booked just before the half hour and that meant he could not go into challenges. Ferran Torres kept on going past him. 

The solution which Simeone has used most is putting Saul at fullback, but the midfielder is not as good there. Atletico also lose stability in the midfield and in attack. 'Marca' say this is Atletico's biggest issue going into the Champions League knockout tie with Liverpool. 

Arias could play on his opposite side and allow Vrsaljko to play on the other side. That way, Saul could stay in midfield. The most important thing is to stop Salah.