Scott Parker has been left out of Charlton Athletic's squad for tomorrow's Premiership match at Everton because manager Alan Curbishley believes he has been "unsettled" by Chelsea's attempts to sign him.

Chelsea have had two offers for Parker turned down this week and Curbishley said he thought the midfielder was "disappointed" not to have been allowed to move to Stamford Bridge.

Curbishley asked Parker to stay away from training on Wednesday and yesterday because the 23-year-old was "not in the right frame of mind", and he will leave him behind for the match at Goodison Park.

To stand a chance of landing Parker, Chelsea will probably have to increase their second offer of £8 million to about £10 million. The club's determination to bring in a midfielder has increased because of a long-term back injury to Juan Sebastian Veron. The Chelsea manager, Claudio Ranieri, is likely to start looking elsewhere unless a deal is concluded shortly.

Parker has been a significant factor in Charlton's rise to fourth place in the Premiership, but Curbishley has chosen to work without him since news of Chelsea's interest surfaced on Tuesday.

"I told him not to come in because he's not in the right frame of mind," said the manager. "He's been unsettled by the transfer talk. It's not right for him or us while we're preparing for a game, so he's not with us at the moment."

Charlton have insisted that Parker is not for sale and have told Chelsea their interest is unwelcome, though the feeling remains that they will do business at the right price. They agreed a £6 million deal with Chelsea for Parker last summer before Roman Abramovich's takeover at Stamford Bridge, but that deal fell through.

"I can't stop clubs bidding for my players - it means we're doing something right - but it doesn't mean we have to accept it," Curbishley said. "Chelsea have been told of our decision and so has Scott. I think he is disappointed by our decision.

"We know what other clubs can offer our players and that we can't compete with that, but it does not mean we've got to jump.

"They've made a bid, but it was turned down completely. We're not naive. There are financial differences but it doesn't mean we've got to do what Chelsea want.

"I can understand everyone's frustration in this, but how about the 24,000 Charlton season ticket holders and the manager who has been here 10 years?"

Parker believes a transfer to Chelsea would be a positive career move. He would be available for the Champions League this season and is willing to take a cut in the number of games he plays for the opportunity to join one of Europe's leading clubs.

Curbishley sought to play down the significance of Parker's absence this weekend. "People forget we've got a decent side here," he said. "I don't want to be disrespectful to the rest of my midfield by thinking we can't go to Everton and get a result without him."