Construction group Balfour Beatty is expected to swing to a loss on Wednesday after a year in which it issued four profit warnings.
The City expects the infrastructure firm to post a £60 million loss, compared to an underlying pre-tax profit of £185 million a year ago.
In January it issued a £70 million profits warning alongside the cancellation of a £200 million share buy-back after the result of a review of the group's UK construction division by KPMG found shortfalls in the value of contracts.
Three earlier profits warnings during the year again linked to its construction contracts amounted to a £210 million shortfall.Chief executive Andrew McNaughton stepped down in May amid the turmoil. New boss Leo Quinn started in January.
Analysts at Liberum now expect Mr Quinn to announce new downgrades on contract provisions of up to £200 million and the scrapping of the dividend. Shares have fallen by more than a quarter over the last 12 months.
The KPMG review found most problems in engineering services, its London region - including major projects - and in the South West. All these units had previously been identified as ''having issues''.
They related to the way in which contracts were bid for and managed as well as the accuracy of assumptions on how they would perform.
Mr Quinn has promised a shake-up of the UK business and will take direct control of the major construction projects division.
But brokers fear Balfour's international contracts in the Far East and the US could also hold problems.
Fresh warnings will revive concern that Balfour is vulnerable to a new takeover attempt, seven months after it closed the door on protracted £3 billion merger talks with Carillion.
Last December Balfour also rejected a £1 billion bid for its public private partnership unit, which builds and maintains schools and hospitals, from John Laing Infrastructure Fund.
Irn-Bru maker AG Barr is expected to report strong annual sales on Tuesday despite heavy discounting in the soft drinks market driven by the ongoing supermarket price wars.
The City expects the Cumbernauld-based firm to post pre-tax profits up 9.2% to £41.6 million after a robust pick up in sales in the final quarter of the year.
The company, which also makes Tizer and Rubicon, said in January that sales were expected to lift by around 2% to £259 million in the period with all core brands performing well.
It said that strong cost control allowed it to underpin its margins despite some of the most aggressive price promotions in the market in the second half of the year.
In a January fourth quarter trading update, it said trading conditions have been volatile "with periods of intense competitive trading activity, as brand owners and retailers across varied channels fought for market share".
The firm added that its sponsorship of the Glasgow Commonwealth Games last summer helped support its brand awareness and promotional activity.
It has also been extending its distribution into the south of England since opening a new factory in Milton Keynes in 2013.
Analysts at Societe Generale said that the soft drinks market was highly promotional with the most "intense competition" coming between Coca-Cola and Pepsi.
The broker added: "Irn-Bru is not immune, but its strategy of expanding into the south of England from its Scottish heartland remains on track, and gives it a growth avenue despite the intense pressure on pricing from the supermarkets."
Last month Irn Bru bought the London-based cocktail business Funkin for up to £21 million.
It said the purchase took the group into the cocktail mixer market for the first time, an area which has shown strong growth in recent years.
Retailer Game Digital is expected to report flat half-year earnings on Tuesday after posting a profits warning at the start of the year.
The video games business said promotions helped it shift Xbox One and Playstation 4 consoles but margins were lower than expected as sales fell 5.4% in the Christmas period covering the 11 weeks to January 10.
Its promotional activity started on Black Friday when games were bundled together with consoles amid ''intense competition'' in the sector.
The City expects the business to turn in full-year underlying earnings at around last year's £51.3 million, well below previous forecasts of £63.8 million.
Brokers at Canaccord Genuity said increased promotional activity over the half year will see gross margins fall 0.4% during the period.
Last October the retailer reported it had swung to an annual profit after making a loss the year before.
Earlier this month Game Digital bought video-game events firm Multiplay for £20 million, which is behind the Minecraft and Insomnia festivals.
At events, gamers can try out new titles and watch top players of titles such as Starcraft and League of Legends.
Multiplay, launched in 1997, has organised 150 festivals in the UK and abroad and last year its Insomnia festival in Coventry attracted 67,000 visitors over the weekend with 1.4 million more tuned into events online.
Liberum broker Tom Gadsby said: "We see excellent strategic rationale with strong cross-selling opportunities between Game's mainly console-based business and Multiplay's strengths with PC-based gamers."
Game was floated in June last year, nearly three years after it was rescued from administration in April 2012. Since its float Game's shares have risen around 30%.
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