Right now i´m pessimistic for , all our teams/athletes with medal chances are either a mistery or not in their best form, or compete in events that are hard to predict. All in all, I´d say something between 1-3. Our most realistic chances for a medal would be:
Field hockey: women´s team should be our best shot this time, they just played their first couple official games in one year so it´s hard to judge their level, but I think they are favourites to medal unlike the last time. On the opposite, the men are the current champions, but the cycle has been a mess and I don´t think they will repeat the podium.
Football (men): impossible to know, depends a lot on the names that can play and even then it´s kinda random. But the team will be more prepared than in Rio, that´s for sure.
Judo (women´s 48 Kg): final olympic tournament por Paula Pareto. She won´t be a medal favourite this time I think, but she´s in the mix and with her experience and a good draw can make it happen.
Sailing (Nacra17): current olympic champions, don´t think they are favourites for a medal again, but who knows, this one is very hard to guess.
Smaller chances, but if all the planets align:
Basketball (men): yeah, the team was the finalist in the last world cup, but that performance will be very hard to repeat and competition will be harder. I don´t see it happening.
Rugby (men): not a medal favourite, but definitely a team that can be in the final 8. And if on the other side there´s no Fiji, then there´s a chance.
Swimming (1500m women´s freestyle): if Pignatiello somehow peaks and throws a PB, it´s a slow race and one of Ledecky/Quadarella/Wang/Li/Kohler gets ill or something, then maybe... But won´t happen.
Taekwondo (men´s 58 Kg): a later addition after posting, Guzmán won bronze in the last world championship, but no idea about his form now.
Tennis: if the tournaments have random results, who knows, especially in doubles. Maybe Zeballos/Gonzalez (men) or Zeballos/Podoroska (mixed) can make some noise.
The rest I don´t know (men´s volleyball?) or it´s too random (shooting?) or just won´t happen.