The former Glanford Park crowd favourite joined the Stags on loan last week, and helped his new club to a 3-1 win over Notts County.
And manager Keith Curle felt that he gave his side the cutting egde to take all three points.
"I'd like to apologise for not making public that we had signed Guy. I wanted to keep the element of surprise," Curle said.
"It probably threw a large spanner in the workings of County's gameplan."