The fundamental forecast for sterling trading this week is bearish, Daily FX has announced.In what is touted as a pivotal weak for the pound, the foreign exchange analysis site warned that the currency is likely to lose ground irrespective of whether risk appetites rise or fall in the wake of the G20 summit in Pittsburgh last week.Sterling slumped across the board last week following statements from Bank of England governor Mervyn King intimating that the institution would be comfortable with a weaker pound because of the support this will give to exports."In the grand scheme of things, economic data is vital at this point; but a meaningful improvement in the outlook will come with time and a wide array of indicators," the site presaged. Prominent among the reports due out this week will be the purchasing managers' index manufacturing survey for September, which is due out on Thursday (October 1st), while the GfK consumer confidence survey will also attract attention on Tuesday.