Motherwell chairman John Boyle has accused Paul Slane of being disloyal after leaving the club for Celtic.
Slane completed a move to Celtic on deadline day with the youngster signing a four-year deal at Parkhead.
The highly-rated 18-year-old rejected several contract offers to stay at Fir Park and his exit has left a bad taste with Boyle.
"We have tried and tried to get Paul to sign a long-term contract but he has continually refused," Boyle told the Daily Record.
"He has been at the club for six years and we have financed his development and nurtured his talent.
"We have also stuck by and supported him over those years through both personal issues and injury.
"We felt we were due some degree of loyalty for our efforts."