BLACKPOOL defender Jordan Gabriel is facing weeks on the sidelines after he was injured sitting on a stool.
Appleton said: “He did it at home sitting on a stool.
“He was just sitting with his legs – I don’t know if you’ve ever done it – but he was just sitting with his legs wrapped around the back of the seat and it’s pulled.
“We won’t know the full extent until he sees the specialist.
“In 10 years as a manager, I’ve known four players who’ve got injured at home and accidents do happen.
“It is part and parcel of life and it is unfortunate.
“I feel sorry for Jordan. He got stronger and stronger in the game on Saturday, so I can imagine his disappointment and frustration and he’ll feel it as much as me.”
Gabriel has provided one assist from full-back so far this season, having missed just two league games prior to Sunderland.
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Blackpool currently sit 19th in the table with three wins, three draws and six defeats so far.