The lira weakened as far as 7.1840 and stood at 7.17 against the US currency at 1200 GMT, compared to a close of 7.11 on Tuesday.
"Some are sure that he will be appointed energy minister but Erdogan will decide. There are also those in the party that say this is not possible," the official told Reuters.
The rand was 0.44% stronger at 14.5550 per dollar, little moved from its overnight close of 14.6200.
There has been a divergence of views among traders this year over just how US President Joe Biden's planned $1.9 trillion fiscal stimulus package will affect the dollar.
The rouble spearheaded an emerging market rally, with stocks trading near record highs on optimism over a global economic recovery thanks to steady vaccine rollouts.
The rouble was 0.3% stronger against the dollar at 74.42, its highest since Jan. 22.