Former Feyenoord star John de Wolf feels they'll miss Karim El Ahmadi.
El Ahmadi is on the brink of a €2.8 million move to Aston Villa.
De Wolf regarded El Ahmadi as Feyenoord's best performer last season and his sale will be a big loss.
"But I can understand it," he reasoned. "They have already purchased a number of midfielders and things could get crowded."