Charlton, who like many clubs, have been hit badly by the credit crunch and will want to cash in on a few players if they are relegated to League One. And the former United front man could make a surprising return to S2 in the summer if the deal for Craig Beattie fails.
Gray who so far has endured the most successful part of his career so at Bramall Lane netted 25 goals in one single season for the red and white wizards. He is currently undergoing treatment for a broken foot.