Chelsea midfielder Lampard admits AVB time was "difficult"
"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.'"