Those clubs may only have a passing interest and if they don't make a bid or offer regular gametime then the pathway to Saints is easier.
Regarding wanting European football, would he get regular gametime for any of those clubs? He is only 21 years old, and he could use Saints as a stepping stone to such a team in 2 or 3 years time. I would have no issue with that. Better to have extremely promising young players for 2 or 3 years rather than plod along with players the top clubs will never want.