Sterling, already trading lower on the day, dropped as much as 0.5% against the dollar to $1.3768. It fell to its lowest against the euro since July 21, down 0.2% at 86.14 pence
sterling was down 0.3% at $1.38200, off the near one-month high of $1.38905 touched on Friday. Versus the euro, it likewise slipped to 85.82 pence, having risen to 85.595 pence on Friday
The dollar index, tracking the greenback against major currencies, is on course for a 0.5% gain this week, which would be close to its biggest weekly gain in about a month.