I've made a site to keep track of the OWWC 2019 team jerseys - aiming to keep it up to date with any alternate jerseys from the teams. Feel free to ping me if I miss one! https://worldcup.slmn.io/jerseys pic.twitter.com/TrserOkSxv
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Probably just the team's individual sponsors - you can see the Netherlands jersey has their recently announced Omen sponsorship. I wouldn't be surprised if we see those sponsor logos get changed as teams partner with other companies.
For clarification, you could pick from the supported blizzard sponsors on the official jersey and you had to reach a deal with them months ago. Most countries got no response from their regional offices.
