Manchester United have reportedly been scouting another 15-year-old wonderkid as a potential replacement for JJ Gabriel.Gabriel travelled to Barcelona last week for transfer talks following the bombshell news that he wanted to leave Man United.Gabriel wants his Man United registration cancelled and has interest from multiple giants – but have the Red Devils spotted a replacement?GettyThe teenage sensation looked to be on a path to potential stardom at Old Trafford, but he sees his future elsewhere.Barca and Real Madrid are understood to be the most viable options for Gabriel should he pursue a move abroad.Meanwhile, Chelsea, Arsenal and Manchester City hold interest in the forward, who has plenty of impressive suitors. His next move is still undecided, Man United may be beginning a Gabriel contingency plan.Man United’s JJ Gabriel replacement?Man United are reported to have been tracking 15-year-old Norwegian forward Gabriel Rajkovic.Rajkovic has already been playing first-team football in his home country with Valerenga, featuring 15 times this season. He has netted three goals and provided one assist in that time, attracting interest from across the globe. Reports from Norway also claim that Barcelona have sent scouts to watch him, with Arsenal and Chelsea monitoring too.Rajkovic doesn’t turn 16 until February, and until then, he won’t be able to transfer to another club abroad. As well as that, the left-footed forward is contracted with Valerenga until 2028, so he may be in no rush to take a step up.Rajkovic scored his first Eliteserien goal at a much younger age than Haaland managedGettyRajkovic smashes Haaland feat Rajkovic has certainly built an impressive reputation in Norway already, having smashed Erling Haaland‘s feat.Haaland, who is now arguably the best striker in world football, scored his first goal in the Eliteserien – the Norwegian top flight – aged 17 years and 16 days old. Meanwhile, Rajkovic netted his first at 15 years, five months, and 15 days old, beating the Manchester City star by a long way.His maiden strike came in August against Bodo/Glimt, on the same day Barcelona were reportedly scouting him.He is the Eliteserien’s second youngest scorer ever, behind Arsenal’s Premier League-winning captain Martin Odegaard.Odegaard still holds the record, having scored for Stromsgodset in 2014, aged 15 years, four months and 29 days old.