West Ham United are understood to be looking into claims that supporters threw items including a giant sausage at disabled Manchester United fans at Old Trafford in April.
United have experienced issues protecting supporters in the disabled section of their group and saw Paris Saint-Germain fans rip down netting designed to stop missiles in February.
The section is situated directly below the away fans' section in the south east corner of the stadium, and the scale of the issue was highlighted by a representative of the Manchester United Disabled Supporters Association.
They pointed to their 2-1 win over West Ham towards the end of the Premier League season, alleging that missiles including drinks, lighters and items of food were thrown into the area.
They said: "The West Ham game resulted in a number of missiles being thrown into the disabled section. These included plastic clubs filled with liquid, cigarette lighters and various items of food, including a giant sausage."
Mirror Football understands West Ham are looking into the allegations.
West Ham lost the fixture in question after two Paul Pogba penalties cancelled out a Felipe Anderson strike in a tight game.
United's forum also revealed they sold all 52,000 season tickets in record time despite their disappointing season, which saw them finish sixth in the Premier League table.
The Red Devils missed out on Champions League qualification but still have a season ticket waiting list of around 75,000.
