The transfer window often opens unexpected doors, and every rumour sparks debate. Premier League fans are well aware that West Ham United need to strengthen their squad, especially in goal. The

BBC Sport looks at why new boss Thomas Frank wanted to add him to his squad – and why the transfer is a rare move for the north London outfit.

We are delighted to announce the signing of Mohammed Kudus from West Ham United, subject to work permit. The Ghana international has agreed a long-term contract and will wear the number 20 shirt. Born in Nima in Accra, Ghana, Mohammed spent his early years locally with Strong Tower FC before joining the Right to Dream Academy in 2012.