If there are clubs competing for him, exploit the situation and sell high.
If it's just one club say ' no thanks'.
I'm afraid the ' here and now' takes priority for a club in our position. Brooks will find his level in about 12/18 months time and nobody knows what that is. At present he does not justify a starting place in our team. 18 months ago he was one of many hopefuls in our junior ranks, nothing special, bit timid in fact. Nobody knows his true level.
If it's £15m, that's the "'here and now'. Brooks would also multiply his wages and for him that's the 'here and now'!