However, the twists and turns of the Brexit process have proved too complex to predict, which is likely to discourage some investors from taking on excessive risk before the EU agrees a new deadline for the Britain's departure from the bloc.
"We're constructive on sterling in the mid-term, because we don't see a high chance for a general election," said Osamu Takashima, head of G10 FX strategy at Citigroup Global Markets Japan in Tokyo.
"My personal concern is once political uncertainty lifts, people will focus more on the UK's economy, which is weakening. This could be a negative for sterling."
The pound gave up 0.1% to $1.2845 in Asia on Friday. For the week, sterling was on course for a 1.14% decline versus the greenback, its biggest weekly loss since Sept. 27.
Sterling traded at 86.46 pence per euro, on course for a 0.42% weekly decline.
Opposition Labour leader Jeremy Corbyn said he would wait to see what the EU decides on a Brexit delay before deciding on a general election.
However, Corbyn also repeated he could only back an election when the risk of Johnson taking Britain out of the EU without a deal to smooth the transition was off the table.
The euro held steady at $1.1103 in Asia on Friday, on course for a 0.62% weekly loss.
The Ifo economic institute's closely-watched measure of German business sentiment due later on Friday is expected to weaken slightly in October, highlighting fears that Europe's largest economy is slipping into recession pressured by the U.S.-China trade war and Brexit.
The European Central Bank left monetary policy unchanged on Thursday after unveiling a big stimulus package last month, but there are concerns the ECB's firepower has largely been spent.
The dollar index .DXY against a basket of six major currencies was little changed at 97.696 but up 0.43% on the week. The U.S. currency held steady at 108.65 yen, on course for a 0.21% weekly advance.
The focus shifts next week to a U.S. Federal Reserve meeting ending Oct. 30 and a Bank of Japan meeting ending Oct. 31.
The Fed is expected to cut interest rates for a third time this year, but fixed income analysts say this is largely priced into the market.
The BOJ is leaning toward keeping policy on hold next week, but the decision is a close call as policymakers struggle with the fallout from the U.S.-China trade war.
(Reporting by Stanley White, Editing by Lincoln Feast & Shri Navaratnam) ((email@example.com; +81 (0)3 4563 2799; twitter.com/stanleywhite1 ;))