Arsenal have submitted a £35million bid for Ajax defender Lisandro Martinez.
The Gunners made clear their interest in the Argentina international last week and have followed that up by submitting a formal offer for the 24-year-old. That could spark Manchester United into entering the race for Martinez, after failing in their efforts to land his team-mate Jurrien Timber.
New United boss Erik ten Hag made central-back Timber his No.1 defensive target, but the Dutch international was advised not to make the move by Holland coach and former Old Trafford boss Louis van Gaal. Timber took on board van Gaal's advice and decided a move to United, with the World Cup less than six months away, was too much of a risk at this stage of his career.