Labour's Sheffield Central MP Paul Blomfield has raised the issue of Carillion's insolvency and its impact on staff pensions in the Commons.
Mr Blomfield asked: "I think it will be very little comfort to many Carillion staff past and present when they hear that their pension fund is approaching a deficit of a billion pounds.
"Public sector contracts have made some at the top of Carillion very rich indeed. So what action is the minister taking to ensure that current and future pensioners don't lose out?"
Business minister Andrew Griffiths responded that anyone worried about their pension can contact the Pensions Advisory Service whose dedicated helpline has now responded to over 800 calls since the insolvency of the construction giant was announced earlier this month.