TRANSFER NEWS: Suarez talks underway, Chelsea land Costa, Man Utd chase Hummels

LIVERPOOL look set to land Alexis Sanchez as negotiations with Barcelona over a move for Luis Suarez get underway. Elsewhere, Chelsea have tied up a deal for Diego Costa, Manchester United are still chasing Mats Hummels, Jackson Martinez wants a move to Arsenal and Newcastle have signed Siem de Jong.

The summer transfer market officially opens today, but clubs have been busy preparing moves behind the scenes for months. Here is a round-up of all the latest news, rumours and gossip...

Barcelona officials will fly into London today to begin formal discussions on Luis Suarez’s proposed move from Liverpool to the Nou Camp.

Liverpool will look to strengthen their defence with moves for Dejan Lovren and Ryan Bertrand as they seek to follow up the capture of Adam Lallana.

Chelsea have confirmed the £32million signing of Atletico Madrid striker Diego Costa.

Porto striker Jackson Martinez admits he supported Arsenal as a child and would love to join them now.

Newcastle have completed the signing of Holland international Siem de Jong from Ajax on a six-year-deal for an undisclosed fee. 

Manchester United boss Louis Van Gaal will make a take-it-or-leave-it offer of £20million for Germany and Borussia Dortmund star Mats Hummels.

Mats Hummels remains a target for Manchester United[GETTY]