Everton will return with an improved bid for Swansea City captain Ashley Williams.
The Blues had a £10m offer for the centre-half rejected on Tuesday night but remain undeterred in their pursuit of the 31-year-old.
Swansea issued a strongly worded statement explaining why they had knocked back the approach for the Wales skipper but Everton will return with a bigger offer to ensure Ronald Koeman lands his defensive target.
When asked about further transfer dealings, Koeman said: "We're working hard to bring in good players.
"It's not respectful to talk about players who are not players of Everton, but we hope to bring some new players in as soon as possible."
Blues skipper Phil Jagielka is back in training after a hamstring injury but remains a doubt for the opening game of the new Premier League season on August 13 when Spurs head for Goodison.
Jagielka has not featured in any of Everton's warm-up games and though Koeman is refusing to rule him out of this weekend's friendly with Espanyol, he remains unsure if he will be fit enough for the first league match.
Asked if he was worried that the Blues captain will not be fit in time, Koeman said: "Of course but he is now training and maybe he can be part of the team for this Saturday. It is difficult for players who lost a lot in pre-season because normally physically-wise you need a good pre-season."
Mo Besic, meanwhile, will undergo a scan after hurting his knee against Manchester United on Wednesday night.