Multiple English clubs have reportedly been “alerted” to Ryan Mullen’s availability after the 18-year-old rejected a new contract with Celtic.

The goalkeeper’s current deal is set to expire at the end of the season, and the Hoops are keen to tie him down to a long-term contract given how he is highly regarded at Parkhead.

However according to Football Insider, “a Celtic source” has revealed that Mullen rejected a contract extension offer and now looks set to be available for a low fee in January or a free transfer next summer.

The report also claims that “a number of English clubs” are now monitoring the teenager amid uncertainty surrounding his Celtic future.

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Mullen’s refusal to extend his deal with the club will no doubt come as a blow, with the shot-stopper regarded as a hugely promising talent within Celtic’s youth setup.

However given how the Hoops have already scouted Gillingham goalkeeper Joe Walsh this season, the club were perhaps expecting Mullen to pursue a move away and have therefore lined up the18-year-old as his replacement.