Salah, 25, is still recovering from a shoulder injury suffered in Liverpool's Champions League final loss to Real Madrid last month.
The superstar forward – who scored 44 goals for his club in 2017-18 – joined his international team-mates in training, but was largely restricted to being a spectator.
Egypt team doctor Mohamed Abou El-Ela said there were still no guarantees Salah would play a part against Uruguay in their Group A opener Friday.
"Everything looks good. His condition is comfortable, but playing against Uruguay is uncertain," he said.
"We'll take our decision after two days as everything will be clear.
