Birmingham City are reportedly preparing a summer move for Charlton Athletic left-back Morgan Fox.

Fox has been ever-present for the Addicks this season, notching up 44 appearances, and his performances have emerged as one of few positive aspects in a disappointing campaign for the London club.

Charlton have already been relegated to League One and it is thought that the 22-year-old is keen on a transfer away from the Valley to avoid playing third-tier football.

The Sunday People reports that Fox has also interested Premier League clubs Swansea City and Manchester United.

The full-back has scored only once during 2015/16, but set-up Johann Berg Gudmundsson’s opener as Charlton beat Leeds United 2-1 on Saturday.

He also played in both matches as the Addicks defeated Birmingham both at home and at St Andrew’s this season.

The Wales U21 international is a viable target for Blues, who have Jonathan Grounds as their first-choice option on the left-hand side of defence. It could be argued that Grounds’ form has suffered from a lack of competition for his starting berth within the Blues squad.

Birmingham boss Gary Rowett recently revealed that he has identified the areas in which his side needs to strengthen, and the left-back position is thought to be high on his list of priorities.

Fox, who was tipped to win Charlton’s player-of-the-year award by local newspaper the News Shopper, would likely fall within Rowett’s budget.

The Valley academy graduate has played over 70 times for Charlton since making his senior debut in February 2014.

He signed a contract extension with the club in September of last year – which runs until 2018 – and earned his first call up to the Wales senior squad in the same month.