Alex Kral says Nikola Vlasic will have a big impact at West Ham.
Kral has joined from Spartak Moscow, while Vlasic moves from CSKA Moscow.
“For sure, it's a really good squad," he told the club's website.
"For example, I know Nikola Vlašić from CKSA, so we were big rivals and now we are teammates! I also know him from Under-21s when we played against Croatia and also from Euro 2020 when we also played Croatia, so I know him really well.
“For sure, really good defenders have come and many players in the team are at a high level. It's the Premier League and I think it's good for us because it pushes me and I push them to do better and better on the pitch."