Arsenal and Chelsea both sent scouts to watch William Carvalho play for Sporting Lisbon last weekend.
The £35 million rated Portuguese midfielder has been linked with both clubs throughout the summer.
Chelsea are thought to be ahead of Arsenal in the race to land him on a long term deal.
Arsenal are reportedly locked in a battle against Tottenham Hotspur to try and sign Brazilian Bernard on a loan deal.
Bernard is thought to be keen on a move away from Shakhtar Donetsk due to the political unrest and conflict in the country.
The Gunners are in a great position if they are forced to lock horns with Spurs in any way.
Atletico Madrid are thought to have called time on their pursuit of Borussia Dortmund star Marco Reus.
Arsenal are one of several clubs to have been linked with making moves for the German international this summer.
Reus could leave BVB next summer with Arsenal well placed to try and do a deal around the £20 million mark.