It did worry me when I watched the PNG game but I'd forgotten all about it until I saw the Guardian article this morning. Whilst KF does use the phrase 'should' be fit for start of training after Christmas I'm prepared to take him at his word as, if the injury was serious, I think that news would have surfaced earlier.
The last few seasons we've started the season with players on the side lines. It would be really good this year if the reports from warm weather training were to show the whole squad in full training together.