Why do you think Vassell s on nearly £20k per week?
I have no idea what he is paid, but that sounds a lot given the circumstances in which he was signed.
This site (no idea whether reliable or not) claims he is on just over £9k per week.
https://salarysport.com/football/player/isaac-vassell/
He had a fantastic debut for us. Sadly it was all down hill from there. If he can stay fit he should be a useful squad player, but staying fit seems to be his biggest problem. Given that, who would want to sign him this window - or even take him on a free and match his current wages (£9k not £20k)?
https://www.youtube.com/watch?v=iqxCiGXQ4l0