Lampard blasted Shelvey for taking a breather when United were under the cosh against the Cherries and suggested that Rafa Benitez does not always trust him.
Speaking about the first goal, which saw Lewis Cook get away from Shelvey to set up Adam Smith, Match of the Day pundit Lampard said: “As good as his passing was the defensive side of his game in the latter stages didn't live up to it.
“There didn't seem to be a problem on the left-hand side but all of a sudden Lewis Cook moved and Jonjo Shelvey doesn't.
“He seen him clearly and doesn't move.
“The ball was played to Adam Smith and by the time the ball hit the back of the net, Jonjo Shelvey has got his hands on his knees and he's bent over, there's no reaction from him at all."
Shelvey had his hands on his knees again during for Dan Gosling's equaliser.
Lampard said: “All of his team-mates are defending for their lives and look at Jonjo Shelvey, hands on his knees, he's moved forward several metres rather than get back to help his team-mates."