Manchester United and Newcastle have suffered setbacks in their pursuit of forward Ivan Toney.
The Brentford striker is wanted by several top teams in the Premier League this summer.
However, a report from Sport1 states that Brentford's likely replacement in Omar Marmoush will not be joining the club.
He was reported to have an offer from Brentford by other German media reports.
However, Plettenberg states that he will stay at Wolfsburg for the coming season.
If Brentford cannot sign the Egyptian, they are not likely to let Toney leave.