Manchester United scouts have been dispatched to watch Mateo Kovacic and Mario Situm this weekend.
The Croatian pair, who have previously been linked with moves to Arsenal, are set to play for Dinamo Zagreb this weekend in-front of a watching Red Devils party at the Stadion Poljud stadium.
It's the second time Manchester United have sent scouts to watch the players, although Sir Alex Ferguson's men are not likely to be alone in the stands for the clash against Hajduk Split.
Gunners boss Arsene Wenger chief scout Bobby Bennett to watch the duo in August, and produced a glowing reference on the pair, who scored three goals in a 4-0 win in-front of the Arsenal man.
Kovacic, dubbed the Croatian Messi and compared to the Barcelona superstar, is a 17-year-old attacking midfielder, while 19-year-old striker Situm has been scoring the goals to draw attention in his services.
Ajax, Bayern Munich and Juventus are also thought to be involved in the chase from across Europe, suggesting English clubs will not have it easy should they wish to land the teenage duo.
Manchester United have invested heavily this summer on bringing youth talent to Old Trafford, and have reaped the rewards so far this season after a stunning start in the Barclays Premier League.
David de Gea and Phil Jones joined a crop of emerging young talent at Old Trafford, and the intent of Manchester United remains clear as they consider moves for the Croatian pair.
Arsenal also have a track record of developing young talent at the Emirates, with Arsene Wenger continuing to invest in players capable of developing into superstars.
Alex Oxlade-Chamberlain is the latest teenage recruit on the fringes of the first team at Arsenal, and Kovacic and Situm would fit the bill in terms of traditional targets of the Frenchman despite his summer transfer spending spree on more senior players.