Chief executive Tom Dobson said heavy piling work had been particularly hard hit and that the group had withdrawn from that market.
Dobson said: "There have been some slight reductions in staff, mostly in the past month. I think we're back on track."
Keller has previously stated that the reasons that it has failed to hit its growth target were delays in jobs and the impact of a weak dollar.
Despite the problems, Keller announced a turnover of £278.8m for the first six months of 2002, up 11% on the same period last year. Pre-tax profit rose 7% to £12.8m.
There have been some reductions in staff … We’re back on track
Tom Dobson, chief executive
Dobson confirmed that the group was still not in a position to hit its 20% growth target, but added that the company would perform strongly at its year-end results.
He said: "Overall, our strong business fundamentals and an order book representing four months' sales give us confidence that we shall report a further year of growth."
Dobson added that the company might make some bolt-on acquisitions of less than £10m over the next six to 12 months.