Reduce da tre pareggi consecutivi, il Chiasso prova a rinforzare ulteriormente la propria difesa nella costante lotta per la salvezza in Challenge League. I rossoblù hanno infatti ingaggiato dal Vaduz fino al termine di questa stagione il difensore Gianni Antoniazzi. Nato a Glarona, il 22enne è cresciuto nelle giovanili dello Zurigo prima di trasferirsi nel Principato, dove ha collezionato 45 presenze con 1 gol e 2 assist e anche 4 match giocati nelle qualificazioni di Europa League.
Il Chiasso ha inoltre portato a termine una tripla operazione di mercato con l'Aarau. I momò hanno tesserato a titolo temporaneo fino al 30 giugno 2021 il terzino sinistro 18enne Stevan Lujic, mentre hanno ceduto agli argoviesi il difensore Bastien Conus (in via definitiva) e l'attaccante Mickael Almeida (in prestito fino al 30 giugno 2021).
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