The transfer period is over, but there are still opportunities. There many good players without a club. Some names of them are big and i think that someone of them will still find a club.
Serge Aurier - Been very successful with Paris Saint-German.
Franck Ribéry - Everyone knows him
Marko Marin - 2019 Player of the year in Serbia
Jack Wilshere - 182 games in the Premier League
Shkodran Mustafi - World Cup Winner 2014
Source:
https://www.transfermarkt.com/statistik/vertragslosespielerhellas verona is reportedly interested in Franck Ribery, according to the gazzetta della sera.
Marko Marin, like M. Balotelli, is a wanderer and will certainly find a new club for another season.

It sure seems that Franck Ribery still has a lot of desire to play at high levels. After his experience at Fiorentina, the 38-year-old would like to continue playing in Serie A. Hellas Verona and Salernitana are ready to welcome him with but there's a problem: Ribery, at Fiorentina, earned four million euros net per season. To find an agreement with one of the 2 teams he'll have to drastically reduce the salary. Otherwise, his transfer to Italy sounds really complicated.