According to North, the move is the result of coach Alexander "ave" Holdt's decision to "test new dynamics" before the next tournament season, in which the team will attend DreamHack Masters Stockholm and the FACEIT Major.
The team's line-up for the Stockholm event will be determined only during the player break, next month, when mertz's future will also be decided, North Director of Esports Jonas "whimp" Svendsen said in a statement.
“Óscar is an experienced and skilled player, and I am happy that he will be playing with us in Valencia," whimp added.
"The trend in rosters is moving towards a more International outlook, and in our current situation, Alexander and I felt that the last event before the player break, would be a good time to change up the dynamics and see how the players react to a new structure.
“We have an important autumn coming up, with a lot of big tournaments, including the Major, and with the lack of consistency that we have been showing we can’t leave any stones unturned.
"I want to see how the team fares in a different setting and to break up the current dynamics."
The announcement comes just days after North were sent packing at ESL One Cologne in the group stage following defeats to fnatic and MIBR. It was the team's first group stage exit at an offline competition in six months, ending a successful run that included a first-place finish at DreamHack Open Tours and a semi-final run at StarSeries i-League Season 5.
mertz has been part of North's main team since January, when he was promoted from the academy roster to replace René "cajunb" Borg. He has averaged a 1.08 rating on LAN since then, leading the team in Kiev with a 1.18 rating to pick up an Exceptionally Valuable Player (EVP) nod.
North will attend the Spanish event with:
Alexander "ave" Holdt (coach)
SEE YOU IN DH VALENCIA!— Oscar Cañellas (@Mixwell) July 9, 2018
I will be playing with @TheNorthIsHere as a stand in infront of my home crowd!
¡NOS VEMOS EN DH VALENCIA!
¡Voy a jugar el torneo como stand in con @TheNorthIsHere, por fin puedo jugar con vosotros de público... Tengo unas ganas tremendas! ❤️🇪🇸