Rudiger had been a regular in the Chelsea team since joining in 2017 but the arrival of Thiago Silva in the summer has seen the German lose his place.
That led to interest from West Ham and Tottenham in the transfer window but Rudiger turned down the opportunity to move away on loan.
His decision to stay appeared to have backfired as Lampard left him out of all but one matchday squad until last week when he was named on the bench for the clash with Sevilla in the Champions League.
He was on the bench again on Saturday for the goalless draw with Manchester United but according to the Telegraph, the 27-year-old reckons he will soon get a chance to prove his value amid a hectic fixture schedule after speaking with Lampard.
The report says Rudiger will assess his situation in the new year as he is keen to retain his place in Germany's starting XI and play at the European Championships.
Meanwhile, Lampard says he is pleased with how his Chelsea players have claimed back-to-back clean sheets after struggling defensively at times this season.
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"Where we have conceded more goals than I would have liked in certain games this season, it is important to try to address those problems," Lampard said.
"Obviously we are addressing them at the back. I thought we defended the box very well [at Old Trafford].
"Defending for me at this level when you have individual players with good quality is about concentration. Concentration is what defines defending in top players generally.
"Thiago Silva on Saturday was a great example of a defender who concentrates at every moment of a game, not just to affect things himself but to affect those around him. That was a big plus.
"The balance is something we will constantly work on. We got in nice areas at certain times.
"We didn’t have the usual spark that we have seen from Timo [Werner] and Kai [Havertz] already, or what Christian can do, but I will take positives in that we defended very well and had at times good control, but did not have the absolute penetration we normally have."