 Complete the following phrase:  He joined the first-team squad partway through the 200708 season, and made his competitive debut for the Manchester United first team on 23 September 2008, starting up front in a 31 home win against Middlesbrough in the League Cup Third Round. Welbecks Premier League debut was made on 15 November 2008, coming on as a 63rd-minute substitute for Park Ji-sung against Stoke City. He marked his debut with a curling 30-yard shot into the top right corner for Uniteds fourth goal in a 50 win. He started in the 