"It's not that difficult for me to find out what really happened and in which condition he is. It's just a few calls to people I know very well and are around him, and they gave me the right information," Tanner said. "We also got a confirmation out of Frankfurt from the physiotherapist there about his training record. … He is fit, he can play, he can start with us in the second phase of preseason."
Source : https://www.philly.com/soccer/marco-fabian-union-mexico-eintracht-frankfurt-mls-transfer-20190209.html