According to a NASL press release, Puzzle has withdrawn from the NASL and the GSL on the advice of medical professionals.

Due to unfortunate circumstances and at the advice of medical professionals, Puzzle of Team SlayerS has withdrawn from both NASL Season 4 and GSL.

Fnatic's Oz will replace him in the NASL lineup. Hopefully Puzzle can make a speedy recovery from whatever it is that is ailing him.Source: NASL.tv