Valve recently released an update which sees some changes to the Negev and the zeus weapon. This forms a part of Valveś attempt to make more weapons play-worthy.
Jokes aside: the negev has been updated "to promote experimentation w/ the weapon" & will be available in the matches until further notice pic.twitter.com/TZUGf15pcF
— ESL Counter-Strike (@ESLCS) April 13, 2017
ESL Will not be allowing the usage of the Negev in their league matches. This will be done, as Valve have responded saying the usage of the weapons is supposed to be an experimentation basis.