Groningen signing Bryan Linssen was impressed by Southampton on the weekend.
Saints thumped the Dutch outfit 3-0 in their friendly encounter.
Linssen said afterwards: "Those guys were all so strong and big, that really was not normal!
"You see that a club like Southampton is many steps ahead than a lot of us.
"The Premier League is the best league in the world, so you must come from a very good team to earn a good result. Also you have to be able to play good football because they are all going to be very good."