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Charlton Athletic have made the first move for Jonson Clarke-Harris, submitting a bid for the Bristol Rovers striker.

The Addicks' interest in Clarke-Harris became clear 10 days ago, when news broke they were interested in both the striker and Rovers captain Ollie Clarke.

Charlton have now strengthened their interest in the 25-year-old striker, submitting a bid that Bristol Live understands to be around £1m plus add-ons.

It is an offer that Rovers will most likely reject, but it is the first concrete move for a player whose future has been speculated over for a number of months thanks to his sensational form - and could well fire a starting gun for other clubs to make firm their interest in the final days of the transfer window.

The Gas are understood to have also requested players on loan from the Addicks in exchange for Clarke-Harris.

There is also a desire from all parties to avoid the sort of late night deadline-day move that saw the Gas sign the striker last year.

Clarke-Harris has netted 21 league goals in 35 appearances since joining Rovers from Coventry almost 12 months ago, with his form at the end of last season winning the Gas vital points in their bid to escape the drop zone.

Plenty of Championship clubs have run the rule over Clarke-Harris since he joined on January deadline day last year, including the likes of Sheffield Wednesday and Middlesbrough - both of whom have been heavily linked with the player this month.

Along with Peterborough United's Ivan Toney, Clarke-Harris has been one of the most talked-about marksmen in League One over the past 12 months, which has prompted interest in both players.

Yet the Posh's high valuation of Toney (quoted in some reports as upwards of £10m), has made Clarke-Harris seem the more viable of the two players for Championship clubs.

Until now, the only offer Rovers had received for his services, though, was a low-ball verbal enquiry of £450,000 from Hull City in the summer, which was immediately batted back.

Yet Charlton's interest in the striker has no doubt been strengthened by speculation over the future of their own key player, Lyle Taylor.

A number of clubs have shown interest in Taylor, who earlier this month rejected an offer of a new contract at the Valley with his current deal set to expire in the summer.

Addicks boss Lee Bowyer had promised to hold fresh talks with Taylor this week after penning a new deal himself, but their bid for Clarke-Harris could indicate an acceptance that their own striker will likely move on this month.

Charlton have also been linked with taking Tottenham Hotspur starlet Troy Parrott on loan for the rest of the season, but face competition from QPR and Sheffield Wednesday.