Bent was ostracised by Lambert and he was sent on a temporary move to Derby County as he seemingly had no future at Villa Park.
Sherwood has reportedly been left frustrated by this decision, though, as he felt the experienced striker could have played a role under his tutelage.
Bent's goalscoring form in the Championship has been impressive and Sherwood is apparently annoyed that he is not part of his squad, as he would like to have the competition for places up front.
The good news for Sherwood is that Bent is due to return to Villa at the end of the season, but he won't have the luxury of being able to use Johnson again.
Lambert agreed a permanent deal to sell the 22-year-old to Preston in January and Sherwood is said to have been left aggrieved by the deal.
Sherwood has always trusted young players and the 46-year-old manager apparently felt Johnson had the potential to make the grade in the Premier League.
The energetic central midfielder has been one of the stars of the lower leagues and Sherwood has been puzzled that Villa let him go so easily.