Chelsea midfielder Frank Lampard admits his time under former manager Andre Villas-Boas was difficult.

The build-up to the Napoli tie was dogged by reports of bust-ups between Villas-Boas and both Lampard and Ashley Cole.

"Maybe it was one of the lower times," said Lampard, who Villas-Boas seemed determined to phase out during his failed Chelsea revolution.

"I knew I wouldn't play 160 games consecutively all the time - these records don't go on forever.

"But it was tough at times for me when I wasn't in the team and frustrating.

"I sat back at times and got the hump indoors but I tried to carry on working hard and in the end it has turned around personally - but not quite to the full extent yet.'"