Fryatt was back for the first time since February after fracturing his jaw against Doncaster.
Pearson watched a virtual reserve side give Leicester their fifth successive win against a Boro side who had goalkeeper Brad Jones sent off.
He said: “It’s great for us to see Matty back because at one stage we were worried if he’d play again this season.”
A Yann Kermorgant curler gave the Foxes a first-half lead and a Richie Wellens penalty sealed it, after Chris Killen’s earlier spot-kick for Boro was saved by keeper Conrad Logan.
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