Arsenal boss Arsene Wenger said earlier in the day the Chilean was "half in, half out" of the north London club, although Guardiola was giving little away when asked if he thought Sanchez was bound for City.
"You know my answer about that, he is an Arsenal player," Guardiola told a news conference after City's 22-match unbeaten start to the Premier League season was ended in a classic at Anfield.
"I don't talk about the players who are not in my team now; unless [they are in it] today. Today would not be good.
"We have the squad we have. I don't know what is going to happen in this transfer window. If we have to finish with these players we are going to finish.
"If we can buy someone, because we have a lot of competitions, a lot of games, we are going to try."
Following Arsenal's 2-1 defeat at Bournemouth earlier on Sunday, Wenger confirmed he expected a resolution to the future of Sanchez within the next 48 hours after the Chilean was left out of the defeat.
"It will be decided in the next 48 hours," said Wenger. "It was difficult for him because he was on standby a little bit.
"If Sanchez goes we need to replace him. When you looked at today we missed many players and you see that they have a big weight in the team.
"Will he go or not? I don't know. At the moment it's the transfer window and in this period we try to use the players who are focused on the club.
"Alexis would have played but it’s a difficult period for him. He has always been committed until now. He could have moved yesterday, today – that’s why I decided not to do it [play him]."
Goals from Alex Oxlade-Chamberlain, Roberto Firmino, Sadio Mane and Mohamed Salah had Liverpool 4-1 up at Anfield, and City were unable to recover despite a late fightback that brought goals for Bernardo Silva and Ilkay Gundogan.
The defeat ends City's chances of going unbeaten throughout the league season, but Guardiola does not believe the result will determine whether the club enter the market.
"I don't think we would say it depends on results to analyse whether you do or don't need it," he added.
"After that defeat you have to think what we have to do, what we believe. What we have to do we have thought since a long time ago and it doesn't change with that result, not at all."