1-Athletics
1-Gymnastics
1-Sailing
1-Shooting
1-Swimming
3-Others (more of the aforementioned sports, tennis, wrestling, fencing, karate, taekwondo, water polo, cycling, rowing, judo)
In athletics our best chances are Stefanidi and Tentoglou. Papachristou and Tzengko I think also have outside chances. I will say expecting 1 medal in athletics is a fair prediction for us.
In gymnastics, Petrounias is the defending Olympic champion. If he qualifies, he is Greece's best chance to win a medal in any sport. The only reason he hasn't qualified yet is because he missed one year due to injury. Especially with the Games being moved to 2021, he is in a good position now and probably back to his normal level.
In sailing, Mantis/Kagialis won bronze in Rio and I think got 4th at the last World Championships. Karachaliou is ranked 2 in the world and Kokkalanis was close to winning medals in 2012 and 2016. Between these three I think we should expect 1 medal in sailing.
In shooting, we obviously have Korakaki who won two medals in Rio and there is also Mavrommatis and Mitas in the men's skeet who are decent. Shooting is an unpredictable sport but I think it is fair to expect 1 medal from this sport.
In swimming, Gkolomeev is our best chance as he won silver at the 2019 World Championships. We also have Vazaios and Papastamos who are good and have improved a lot. I also think it is fair to expect 1 medal here.
Now for the rest we have some chances like tennis (Tsitsipas and Sakkari), fencing (Gkountoura), karate (Chatziliadou), taekwondo (Telikostoglou), wrestling (Prevolaraki), basketball, water polo, maybe someone in rowing or judo, cycling (Volikakis), or some other surprises in the other sports like sailing (Mitakis), athletics (Kyriakopoulou) etc.
It is hard to predict because we have a lot of people with chances but not many clear favourites. So I will say 8!