Asked about the negotiations which saw Chelsea beat Arsenal to the signing, Potter told BBC Radio 5 live after the Blues' win on Sunday: "We're delighted he is here, I've no idea in terms of how it's happened.Todd Boehly, who led an American consortium in taking control of Chelsea in May last year, has recently stepped down from his role as interim sporting director, allowing new technical director Christopher Vivell and director of global talent and transfers Paul Winstanley to take a leading role in recruitment.Mudryk is Chelsea's fifth signing of the January transfer window following the arrival of Joao Felix on a loan deal from Atletico Madrid, plus the permanent signings of Benoit Badiashile, David Datro Fofana and Andrey Santos.He could make his debut appearance for the Blues in the Premier League against Liverpool, who sit one position above 10th-placed Chelsea, at Anfield on Saturday.- Visit our Chelsea page for all the latest Blues news, analysis and fan views- You can now get Chelsea news notifications in the BBC Sport app - find out more- Our coverage of Chelsea is bigger and better than ever before - here's everything you need to know to make sure you never miss a moment- Everything Chelsea - go straight to all the best content"