Celtic manager Martin O'Neill has made it clear he wants to keep his key players despite growing transfer interest.
The club is preparing to start its Scottish Premiership title defense against Dundee on Monday.
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The Scottish champions have seen 14 players leave this summer, including winger Daizen Maeda to Ipswich for £10 million.
Joel Mvuka and Junior Adamu have also departed.
Premier League clubs are circling, with West Ham submitting an opening bid for midfielder Arne Engels.
Everton manager David Moyes has also made contact regarding Canadian right-back Alistair Johnston.
O'Neill confirmed that West Ham's offer for Engels did not meet Celtic's valuation. He also addressed the ongoing interest in Johnston, who impressed at the World Cup.
"Everton have been in contact," O'Neill said. "I'm not sure whether there has been a bid in for that one.
In fairness, David [Moyes] did call me last weekend to tell me that there would be contact.
But I don't know how far that has progressed, or if it has at all."
Concern Over Squad Turnover
During his pre-match press conference, O'Neill expressed concern about the number of exits compared to incoming players.
"I was hoping as each day went past that there wouldn't be any serious interest. But that was never going to happen.
Now that you say 14 [players who have left] I'm worried myself," O'Neill said.
Celtic's recruitment team has spent around £17 million on two central forwards. Kasper Hogh arrived for a club-record £11 million, while Camilo Duran joined for £6 million.
