I think you will need to track them on the last day. Because me and many others have joined the contest few days later. Our goal keepers already had some clean sheets while taking the screenshots.
But what a bad luck. I was playing today against a very weak team. Surely it would have been clean sheet. But despite the opponent having 18 legit players, somehow it showed the opponent didn't turn up with enough eligible players. So no clean sheet for my GK and no goals for my players today.
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