Luke O’Nien has named one of his Sunderland teammates as someone he has ‘learned a lot’ from during a very difficult campaign. Luke O’Nien joined Sunderland in 2018 and has now surpassed 250 appearances for the club. The 29-year-old has been a regular in the senior team, playing in various positions in midfield and across the backline. The club’s return to the Championship has seen him adopt a permanent position in central defence though, while he has been handed even more responsibility with the captain’s armband over the last year. O’Nien became captain this season after Corry Evans was side…