Thiago has praised Liverpool's squad depth after the win over Inter Milan on Thursday.
Liverpool were on the ropes before Jurgen Klopp made three substitutions early in the second-half.
The Reds went on to win 2-0 in the Champions League round of 16 first leg.
Asked if the substitutes made an impact, Thiago told the club's website: "For sure.
"The pitch didn't help both teams physically and we [had] a bit of heavy legs in the second half, and then came the fresh legs inside.
"Great people, technical people, so after that we controlled even more the game."