Boro chairman Steve Gibson is backing the campaign
Workers at the threatened Corus steelworks on Teesside took their bid to save their jobs to Middlesbrough FC's home ground.
They marched around the Riverside pitch before Saturday's game against Ipswich after the club offered its backing to their campaign.
Players also showed their support by wearing "Save Our Steel" T-shirts during a warm-up before kick-off.
Up to 2,000 jobs at the Teesside Cast Products factory in Redcar are at risk.
It follows an announcement in June that an international consortium was pulling out of a deal to buy its steel.