United won 1-0 thanks to Joshua Zirkzee's late goal.
Lisandro later said: "For sure it is really important and the most important thing is the three points - we still have to improve a lot.
"It is difficult to play for this big club, but we live for that and we have to play in a positive way. We have to take this pressure and like today we had a good connection with the subs and fans as well - I am proud to play for this club.
"I didn't play many games as left full-back, but as a player you have to give everything to the team. If the team needs me there I will give everything. If I have to play there I will give everything.
"As a player we are ready for everything, it is part of our job. If you play bad you have to be ready to be criticised, the first two games (last season) I didn't play well and I take that responsibility.
"I always believe in myself and I know that I am not really tall but I will win."
On Adama Traore, he added: "I sent him to the gym! He is difficult to play against and I learned from the first situation, in the first situation he killed me but then I killed him back."