West Ham United has identified Celtic midfielder Arne Engels as a transfer target.
The club also agreed to sell 22-year-old Freddie Potts to Belgian champions Club Brugge for a fee exceeding £10 million on Saturday.
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The Hammers accepted a package worth up to £10.2 million for Potts. The academy product is scheduled for a medical in Belgium.
Potts decided to leave after West Ham sold Mateus Fernandes to Tottenham Hotspur and Crysencio Summerville to Al-Hilal.
Celtic's O'Neill Confirms West Ham Approach
Celtic manager Martin O'Neill confirmed that West Ham made an approach for 22-year-old Engels. However, the initial bid fell below the Scottish champion's valuation.
O'Neill also revealed that Everton manager David Moyes contacted him regarding potential interest in Canadian defender Alistair Johnston.
The Scottish club faces potential midfield depletion after Daizen Maeda departed to Ipswich Town for £10 million earlier.
Celtic have brought in Kasper Hogh and Camilo Duran as reinforcements.
"Everton have been in contact," said O'Neill.
"I'm not sure whether there's been a bid in there for that one, but they've been in contact saying that there would be."
The Celtic manager noted that Moyes personally reached out to give advance notice about Everton's interest in the Canadian defender.
"In fairness, David Moyes did call me last week to say there would be contact," said O'Neill.
The manager acknowledged the reality of top European clubs targeting his primary squad members ahead of the domestic league opener against Dundee FC.
