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Kalvach byl během uplynulých týdnů spojován se Slovanem Bratislava a kromě toho se mluvilo o zájmu ze zámořské MLS, nakonec se však zkušený záložník vydává do Kataru. Olomoucký odchovanec podepsal nespecifikovanou smlouvu s Qatar Sports Club.
Zanedlouho třicetiletý středopolař opouští Plzeň po šesti letech, během nichž patřil k hlavním oporám. Kalvach se výrazně podílel na zisku posledního titulu Viktorie v sezoně 2021/22.
Za západočeský celek nastoupil do 256 soutěžních zápasů s bilancí 19 gólů a 48 asistencí. Skvělými výkony v Plzni si řekl o šanci v reprezentaci, kde zapsal pět startů a jednu branku.
Qatar SC za sebou nemá vydařenou sezonu, když obsadil desáté místo z dvanácti v katarské nejvyšší soutěži. Kalvach by mohl v týmu nahradit Javiho Martíneze, někdejší opora Bayernu Mnichov nebo baskického Athletiku po čtyřech letech nedostala novou smlouvu.