The median overnight interbank rate on the Egyptian pound rose to 7-1/2 percent on Sunday from seven percent the previous session as dealers said a central bank deposit auction withdrew some cash from the market.
"The market is a little tighter today because of the auction on Thursday and there are more auctions, deposits and T-bills, today," said one trader.
The central bank accepted offers for three billion Egyptian pounds ($485 million) of 28-day deposits on Thursday, withdrawing some liquidity from the market.
The central bank was also due to auction on Sunday 1.1 billion pounds of 28-day deposits and 1.6 billion pounds of 91-day T-bills.
Six of 10 banks contacted by Reuters had dealt overnight money at rates between 6-3/4 and eight percent, compared with 5-1/2 to seven percent on Thursday.
Six banks also dealt one-week money at between 7-1/2 and 8-1/2 percent, versus Thursday's 7-1/4 to 8-1/4 percent.
The overnight CAIBOR slipped to 7.5467 from 7.5539 percent on Thursday. The one-week CAIBOR edged down to 7.9762 from 7.9881 percent the previous session.
On the official foreign exchange market, the pound last traded against the dollar at a midrate of 6.17 in banks and 6.19 in exchange bureaux, around Thursday's weighted average of 6.19.
Two market sources said the dollar would buy between 6.40 and 6.50 pounds on the black market, but another market source heard a rate of 6.35 pounds, slightly stronger than rates of 6.55 and 6.60 heard on Thursday.