徐宏傑喺香港出世，中二嗰陣加盟離島區隊青年隊，直到一年後比朋友邀請嘗試考入流浪青年軍，加盟後因為時時犯錯導致信心盡失，最終佢成個季有時甚至連後備席位都沒有、只係得兩三場上陣機會，直到在中四時佢打算放棄足球專心喺籃球上發展，好彩當時佢嘅足球校隊隊友係學界冠軍而積極練習，結果佢被隊友們感染並重新愛上足球離開籃球隊，後尾佢成功爭取到流浪青年軍嘅正選位置後，喺中五時為求進步主動向青年軍教練羅國豪請求到一隊跟操，結果佢比當時一隊教練列卡度賞識安排到標準流浪訓練，同埋喺中六應考中學文憑試前獲流浪總監李輝立同羅國豪邀請註冊成職業球員。
Xu Hongjie was born in Hong Kong, and joined the youth team of the outlying islands district team in the second year of secondary school, until a year later he invited a friend to try to be admitted to the Wandering Youth Army, and after joining, he lost confidence because of mistakes from time to time, and finally he sometimes did not even have a reserve seat throughout the season, but only had two or three opportunities to play, until he planned to give up football to concentrate on basketball development in the first year of high school, fortunately, his football teammates at that time were school champions and actively practiced, as a result, he was infected by his teammates and fell in love with football again and left the basketball team, and later he successfully won the regular position of the Wandering Youth Army, and in the fifth year of the second school, in order to make progress, he took the initiative to ask the youth army coach Luo Guohao to join the first team to follow the exercise, and he was more than the coach of the first team at that time to arrange standard wandering training, and before the senior high school entrance examination, he was invited by the wandering director Li Huili and Luo Guohao to register as a professional player.