No deal has yet been struck with any team but Crawley manager Steve Evans has revealed he is in regular contact with Swindon, MK Dons, Southampton and an unnamed Scottish Premier League side.
Evans told the non-league club's official website: "The interest in the lad should come as no surprise to anyone. He is lightening quick, strong, moves well and scores goals so I would expect the likes of Paul Ince, Danny Wilson and Alan Pardew to be interested.
"Each of the clubs mentioned have been told privately where we value Charlie and at present that valuation has not been met by any club, but that of course may change."
Meanwhile, Swindon manager Wilson is confident a deal will soon be struck to extend Bolton forward Danny Ward's loan until the end of the season.