However, scans have showed there to be no serious damage to the knee and Angel could yet make the squad to face Luton Town in Wednesdays Worthington Cup clash at Villa Park.
Villa manager Graham Taylor said: "He got severe bruising from the tackle by Darren Purse and had a bit of a reaction in training last Thursday but he's seen the specialist and there's nothing apart from bruising and swelling around the knee.
"It's just a question of that settling down and he might be okay for tomorrow, we'll have to wait and see."