The defender is a doubt for the remainder of the season after he came off within 20 minutes of the Premier League clash against the Foxes on Sunday.
Losing Mina would be a big blow to Lampard, as his side aim to avoid relegation, despite their impressive 2-1 win against Leicester on Sunday.
"Yerry had a small feeling in his calf," Lampard said post-game.
"We don't know [how bad it is yet].
"Hopefully it isn't a tear. He felt it in his calf, so he had to come off.
"We're hoping it's not a high-level injury and we can keep him involved in the next two weeks. He will have a scan tomorrow.
"With Myko [left-back Vitaliy Mykolenko], we hope it was just cramp. It would be a result if that is the case."
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