Christian Eriksen will be a man to watch when Manchester United tackle Ajax in the Europa League and Sir Alex is fully aware of the threat posed by the young midfielder.
The Denmark international may have been touted as a potential Reds target by the press but has remained loyal to the Amsterdam outfit and continues to learn his trade in the Dutch Eredivisie.
Eriksen scored the opening goal in the recent 4-2 defeat at Feyenoord and is the reigning Danish Footballer of the Year.
"There's a lot of attention on the young kid, you know, the Danish boy," said Sir Alex. "We'll see what he's like and obviously everybody is going to be watching him.
"Ajax have always been capable of producing great players, that's the great thing about that football club. When you think back over the years to the likes of Johan Cruyff and Ruud Krol, they were some players."