West Ham are in talks to sign Czech Republic midfielder Alex Kral from Spartak Moscow after completing a move for Nikola Vlasic from CSKA Moscow.
Kral, who joined Spartak in 2019, is also interesting Italian side Atalanta.
Croatia midfielder Vlasic, 23, joined the Hammers on a five-year deal after a fee of 30m euros (£26.8m), plus 9m (£7.7m) in add-ons was agreed.
Vlasic has 26 caps for Croatia, four of which came at Euro 2020, including as a substitute against England at Wembley.
He moved to Everton in August 2017 for £10m and made 19 appearances before joining CSKA in the summer of 2019.