Paul Cox has spoken to the press following this afternoon's disappointing home defeat to Newport County.
The Stags recovered from a two-goal half-time deficit, but second-half strikes from Aaron O'Connor and Jefferson Louis handed the Exiles a closely fought victory.
"We can't defend set pieces like we did today," said Cox who was speaking after the game.
"All Newport have done is put the ball in the box three times and they've got three goals from it. It's as simple as that. It is a very disappointing start to the season, but the book stops with me and I'll make changes to the team if I have to." Ross Dyer was taken off on a stretcher midway through the first half, and the manager is still unsure of the extent of the striker's injury.
"I've not spoken to the medical staff yet. We're all just hoping and have our fingers crossed that he is going to be okay."
Dyer's replacement, Jake Speight, grabbed two goals to take his tally for the campaign to five goals (including pre-season) and Cox also revealed that he had considered naming the former Wrexham striker in his starting line-up. "To be honest with Jake, it was in my mind to start him today but I thought he'd missed just a little bit too much of pre-season. "He did well when he came on, but that isn't my main concern today.
"When you score three goals at home and don't win the game, it isn't good and we have to improve in this area." The Stags are next in action on Tuesday night when we travel to Gateshead for our first Blue Square Bet Premier away match of the season.