• The 20-year-old Swiss midfielder will join from Sion • He is a cousin of former Manchester City player Gélson Fernandes

West Ham have agreed a £5.5m fee with the Swiss club Sion for Edimilson Fernandes, with the 20-year-old midfielder set to travel to London on Wednesday for a medical.

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Fernandes, who is a cousin of the former Manchester City player Gélson Fernandes, is a product of Sion’s youth system and made 26 appearances in the Swiss Super league last season, scoring one goal. He also started the Europa League group stage tie against Liverpool last October, which ended in a 1-1 draw, and the second match against Jürgen Klopp’s side in Switzerland in December.

Slaven Bilic has been searching for midfield reinforcements with Italian clubs also showing an interest in Pedro Obiang this week. Fernandes, who has played for Switzerland’s Under-21 side, is expected to sign a four-year contract, subject to passing his medical.

Bilic has confirmed he is interested in Manchester City’s Wilfried Bony, while Simone Zaza is reported to be weighing up a move from Juventus.

The West Ham co-chairman David Sullivan is recuperating after heart surgery on Tuesday. The 67-year-old’s son, David Sullivan Jr, tweeted a picture of his father lying in his hospital bed on his mobile phone. In his tweet, Sullivan Jr went on to suggest his father was already back to negotiating the arrival of new players at West Ham, with the transfer window closing in a week’s time.

“Dad has just had heart surgery, woke up from operation and is straight back on the phone to sign more players,” he said.