The 21-year-old forward made the comments following his side’s 6-1 aggregate victory over Rangers in the Scottish Premiership playoff final.
Erwin played for the entire 90 minutes of the second leg at Fir Park on Sunday afternoon, and he was delighted to have helped his side to a 3-0 win.
Speaking to BT Sport after full time, the young Scot revealed that he was overjoyed with Motherwell’s success despite being a Rangers fan.
“I am proud,” Erwin told BT Sport. “Although I supported Rangers as a young boy, Motherwell are the team for me and I (am happy that I) could keep them where they belong.”
Erwin’s current contract with Scottish Premiership outfit Motherwell runs out in the summer, and he has been linked with a move to England.
However, it will not be easy for the West Yorkshire club to snap up Erwin, as Scottish Premiership giants Celtic are also interested in his services.
According to a report in The Scottish Sun last month, Celtic want to sign the highly-rated young Scottish forward.