JVS has done a massive interview with sport24, where he covers plenty of topics it is worth a read!
He address the Manolas/Siovas/Sokratis situation. He basically clarifies what we already knew, at the start of the qualifiers he reached out to Manolas and asked him to come back. JVS claims the conversation was a good and healthy exchange. A few days later Manolas calls back says he won't be returning. JVS expresses disappointment and tells him the door is always open for a return. Similar story with Sokratis. They have refused the call-up, presumably having being offended by not being called up for over a year by the time WC qualification rolled around.
As for Siovas he said it is a different situation entirely, he feels Siovas spoke out of turn and hurt the teams comradery.
He also talks about Tzolis, Tsimikas, Giannoulis and plenty of other topics.
Full interview here https://longreads.sport24.gr/John-van-Schip/index.html