The Labour leader, Ed Miliband, has welcomed new the Middlesbrough MP to the Commons.
Andy McDonald MP had a majority of more than 8,000 in Thursday's by-election over UKIP who came second for the first time in a parliamentary seat in the region.
Mr Miliband praised Mr McDonald for his services to Middlesbrough over the years.
He said: "You are somebody who served the people of Middlesbrough as a solicitor. You worked incredibly hard for people there."
More top news
Sunderland's 2-2 draw at Aston Villa was probably as much as we deserved, given the share of chances
Boro bounced back from home defeat in some style with a thrilling 3-1 win at Sheffield Wednesday.
After the demolition of Northampton in the cup midweek, the Geordie nation would be well and truly up for the Arsenal visit.