Everton will reportedly pay a transfer fee in the region of £50 million for the services of Sigurdsson, who scored nine Premier League goals last season for the Swans.
"We are still in a situation at the moment where there's a difference in opinion on the valuation of the player, but I don't think it's far off. I get the sense it's closer".
When asked about the decision to leave Sigurdsson out of a side that lacked creativity from midfield at St Mary's, Clement added: 'You're potentially playing a player who might be physically well and might say that he'll play, but what's the motivation like?
Gylfi Sigurdsson attempted 1,001 passes in the Premier League last season.
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'The other thing is in this period, if the player gets injured in a full throttle Premier League game, any potential deal is gone.
Bookmakers firmly believe all three deals will be going forward - the odds on Sigurdsson going through to Everton are 1/10 to sign him and he is 7/1 to stay at The Liberty Stadium.
The Swans hope to resurrect the 28-year-old's dwindling career and also want to bring another player from Stoke back to the club in Wales worldwide midfielder Allen, despite having an initial enquiry knocked back by the Potters.
The Swans want £50m for the Iceland star and, once he has left, they can begin bringing in players of their own, with Bony, Allen and Chadli top of their list.
Sigurdsson produced some excellent performances for Swansea last season, with the Iceland global creating 72 chances and scoring nine goals in the Premier League.