Birmingham City are preparing a fresh offer for Rangers striker Kris Boyd.
The Barclays Premier League club sent scout Malky Thomson to Celtic Park to watch the 26-year-old in Sunday's 1-1 draw in the Old Firm derby.
City's Alex McLeish, the former Rangers manager, had a £3.75m bid accepted by the Ibrox club last January, but the player rejected personal terms.
But Boyd is out of contract in the summer and there are no signs of a new deal being agreed with Rangers.
He is free to talk with other clubs this month about a move at the end of the season.
So Rangers, still heavily in debt, could be willing to cash in on the striker, although he is now likely to command a lower fee because he is in the final months of his current contract.
Boyd was a peripheral figure as reigning champions Rangers were forced to defend for much of Sunday's derby yet secured a draw that maintained their seven-point lead over Celtic in the Scottish Premier League.
However, last weekend he captured the headlines by scoring five goals in the 7-1 demolition of Dundee United to break Henrik Larsson's SPL goals record.
Boyd, who has also been linked with other clubs in England and Germany over the last year, is also poised to add to his 15 Scotland caps.
The striker is likely to be invited back into the national squad by new head coach Craig Levein after having ruled himself out of contention because he had been forced to sit on the bench under previous boss George Burley.
Boyd was just one of a number of players being watched by English clubs during Sunday's derby.
Middlesbrough's Gordon Strachan, the former Celtic manager, and Ipswich's Roy Keane, himself a former Celtic player, were among those observing the game.
Celtic defenders Gary Caldwell and Stephen McManus, plus team-mates Scott McDonald and Aiden McGeady, are thought to be among those on the radar of English clubs.
McDonald scored the game's opening goal, while winger McGeady, who has been linked previously with Birmingham, was again in excellent form and provided the assist for the Australian striker.
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