Derby are due to take on Leeds tomorrow, and they could be without Waghorn again, in what would be a bitter blow for the Rams.
Derby know they will travel to Elland Road needing to score if they are to make it past Leeds.
Lampard’s men were beaten 1-0 by Leeds in the first-leg and they missed Waghorn.
Dave Nugent, who was selected to start up-front, did not cause Leeds’ defence many problems.
And Lampard says Derby will be giving Waghorn as much time as possible to get fit for the clash.
"He broke down on Friday," Lampard said, "but he is desperate to be involved. He will be assessed up until the last moment."
Leeds have beaten Derby all three times the two sides have met this season.
Marcelo Bielsa’s men have injury concerns of their own though, with Kemar Roofe and Adam Forshaw both sidelined.
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