Remember that Anderlecht players are typically expensive. It's the only Belgian team where you hardly ever get a good deal. Genk, Club Brugge and Standard are typically better quality for price. Kevin De Bruyne, Thibault Courtois, Carlos Bacca, Axel Witsel, Junior Malanda (God rest his soul), Ivan Perisic and so on were all sold for very little (all under 10 million) and grew to be top class or world class footballers, either way, they all at least tripled their transfer fees in their next transfers (Malanda would have easily done so and for Courtois it's more as a figure of speech).
Anderlecht is a different case though. They successfully profiled themselves at the "elite" of Belgium (in reality, the top teams in Belgium are usually pretty equal). So be weary. Mbodj is not the kind of prolific top talent that belongs in that little list of mine up here. Kabasele (now at Watford since this summer) and Engels are considered better, more solid central defenders from the Belgian competition. But who knows, Mbodj is by no means a bad player, he's Anderlecht's best CD.