Former Carlisle United striker Sam Cosgrove has completed his move from Aberdeen to Birmingham - with the Cumbrians on alert for a financial boost.

United are expected to benefit from a sell-on clause in the deal which took Cosgrove from Brunton Park to Aberdeen three years ago.

A reported fee in the region of £2m could mean a six-figure sum for the Blues.

One national report today in the Sun on Sunday suggested Carlisle could receive 20 per cent of the profit of any move from Pittodrie. Given Aberdeen signed the striker for around £40,000 in January 2018, that could see Carlisle's windfall work out at something in the region of £392,000.

Any figures, though, are unconfirmed, with United declining to comment on the deal.

The fee paid by Birmingham is also officially "undisclosed".

It seems clear, though, that Carlisle stand to benefit from the player's brief time at Brunton Park, with chairman Andrew Jenkins having confirmed recently that the Blues retained a "financial interest" in the 24-year-old.

Supporters' trust CUOSC, who have a seat on both the holdings and operational boards at United, also recently confirmed the existence of a sell-on clause.

Any potential cash injection would be timely as the Blues continue to negotiate their way through the challenges of the Covid-19 pandemic.

Former Wigan man Cosgrove joined United in the summer of 2017 under former boss Keith Curle.

He made 12 appearances and scored one goal, moving north of the border shortly after forcing his way into the first team.

He scored 47 goals in 103 appearances for Aberdeen, including 23 goals last season and three this campagn after returning from a knee cartilage injury.

The fee taking him to Championship club Birmingham has not been confirmed by either club, but Aberdeen said it was a "significant deal".

Cosgrove has signed a three-and-a-half year deal and said on his new club's website: "It feels really good to be here. As soon as the interest was there from Birmingham it was a no brainer from me and I'm really delighted to get it over the line.

"There's a big job for me to do here. I'm looking forward to playing in the Championship.

"I know how demanding it is but I wouldn't be here if I didn't think I was ready to take on the challenge."