Insiders revealed how Lampard and his staff have seen plenty of potential and are quite excited by his raw ability, but they have been slightly frustrated by the fact he has not yet showcased that in the Premier League.
USA international Pulisic, 21, - who was signed in January but stayed in the Bundesliga until the summer - has featured in just seven matches for the Blues so far this term.
And in another blow, he was hauled off in USA's embarrassing 2-0 defeat to Canada during the international break - and started crying on the bench.
In training, Pulisic has looked top notch.
But he has not been able to transfer that on to the pitch, which has forced Lamps to leave him on the sidelines quite often.