Coburn has signed a long-term deal at the Den and it’s understood the deal is worth in excess of £5m including potential add-ons. Other clubs were interested in the striker, which helped to drive the fee, but Millwall were always favourites with Coburn having enjoyed his loan spell in the capital last season.
Millwall tried to sign Coburn on a permanent deal in January but after a deal couldn’t be agreed at that stage, the Lions prioritised the capture of the 22-year-old this summer.
Coburn leaves Boro having made 56 appearances after coming through the academy ranks at Rockliffe.
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With Tommy Conway having enjoyed a hugely impressive first season on Teesside and Boro prioritising the signing of another striker this summer, Coburn would have likely spent next term on the fringes at the Riverside.
Steve Gallen, Millwall’s director of football, said: “I’m absolutely thrilled that we’ve secured the signing of Josh Coburn.
“It’s no secret that we’ve been eager to bring him in on a permanent deal. We’ve been long-term admirers – he’s a young centre-forward with exactly the qualities we’ve been looking for.
“Josh made a significant impact for us last season, particularly the second half of the season where he really stepped up. He scored some crucial goals and contributed in so many other important ways on the pitch.
“This is a major signing for the club and a real statement of intent. I’m delighted he has chosen to sign for us, especially given the strong interest from elsewhere.
“Once again, we’ve broken our transfer record to make this happen, and I want to thank the Chairman and the Berylson family for their incredible support. A big thanks as well to Alex Neil, who has backed us throughout to get this deal over the line.”
