The Swede's long-term future as City boss is in severe doubt, with reports suggesting he will be sacked after the final two fixtures of the Premier League season.
Eriksson has enjoyed an encouraging first campaign at Eastlands, but appears to have failed to impress owner Thaksin Shinawatra, who bought the club last year.
Eriksson won three League titles and took Benfica to both the European Cup and Uefa Cup finals during his previous stints, which were between 1982-1984, and 1989-1992.
And Still has failed to rule out the possibility of Eriksson returning to Estadio da Luz, but admits his salary demands may prove a stumbling block.
"The door is not closed for Benfica," Still, who says nothing will be considered until the end of the season, told Portuguese newspaper O Jogo. "The question of money is important.
"He is unlikely to continue, but it is still not 100 per cent certain that he will leave Manchester City.
"He may have been contacted indirectly. If any club wish to talk with Eriksson, they must call me. They have my number."