"?Laurent Koscielny has been lavished with praise by Slaven Bilic, who is working as a television pundit during Euro 2016.
Speaking on "?ITV during France's 2-1 over Romania, the West Ham manager said: "Koscielny is one of the best centre-backs in the league and maybe even Europe."
The Frenchman's team sit top of Group A after also beating Albania 2-0 - a result that means they will finish as group winners as long as they avoid defeat in their final game against Switzerland on Sunday.
The 30-year-old has been instrumental to Arsenal in recent years, and last season the club finished second place in the Premier League with the joint second-best defensive record.
He joined from FC Lorient for £8.45m in 2010, and has been the only consistent centre-back at the club in that time. Numerous partners have tried to become a mainstay in the side with him, with Brazilian Gabriel Paulista the latest first-choice partner for the Frenchman.
Manager Arsene Wenger has already been active in the summer transfer window, signing Granit Xhaka from Borussia Monchengladbach.
He has also been linked with trying to boost the attack of his side. Leicester City and England's Jamie Vardy is mulling over whether to join the club after the Euros, with the London club willing to meet his buyout clause.
If that fails, other names that have been linked include "?Mario Gotze, Islam Slimani and Henrikh Mkhitaryan.
N'Golo Kante - who has impressed for both Leicester and the French national team - is also reported to be a target for the Gunners, as the club look to add more energy and work-rate into their midfield.