INDIANAPOLIS -- Lions general manager Martin Mayhew said he takes the blame for the tampering charges that were issued against the team by the NFL a week ago.

“As far as the tampering case just like anything else you win some, you lose some. As of right now we lost that one. I take the blame for that, it’s my fault.

The way I feel about it, when that kind of thing happens what you have to go back and re-evaluate what you did, what you didn’t do, things you can do differently then you move on,’’ Mayhew said on Friday morning.

He said there are too many positives going on with the team right now to concentrate on the negatives.

Mayhew said they have until Monday to decide whether to appeal the charges.

The charges were filed by the Kansas City Chiefs in December and are believed to involve Lions defensive coordinator Gunther Cunningham and safety Jarrad Page, but that has not been confirmed.

Mayhew made a statement on the tampering, but would not answer questions about it.

(Follow me on Twitter @PaulaPasche. Come back throughout today and the weekend for updates from the NFL Combine.)