The capital side were heavily linked with a loan move for the the Egyptian but were just beaten to the deal by Fiorentina.
Salah joined ‘La Viola’ until the end of the season with the option to make his deal with the Italians permanent after Juan Cuadrado made the reverse move.
And the Chelsea outcast has already impressed at his new club, helping knock out domestic rivals Roma from the Europa League.
Sabatini told Sport Mediaset: “I made a mistake in January, the team needed reinforcements in attack.
“I have made choices that immediately have not been successful and the team has suffered.
“I’ll have to take account of my mistakes. Salah? It’s a regret, another mistake I made.”
By Phil Wellbrook
