The Lions were not favored to win at Philadelphia, everyone knew it would be a tough game. 

Then they jumped out to an 8-0 lead at the half, a 14-6 lead after three quarters and lost in a complete fourth-quarter collapse to the Eagles, 34-20.

Detroit (7-6) is still atop the NFC North but they could be tied with the Chicago Bears (6-6) as soon as Monday night. The Bears play the Cowboys (7-5) on Monday Night Football at Soldier Field.

Here are five reasons Lions’ fans should be concerned:

1. The Lions have lost three of their last four games. Certainly not the way a team headed into the playoffs wants to wrap up the season.

2. The defense’s fourth-quarter meltdown

was epic. They were playing with a full house — no injured starters missed the game. No excuse. The offense can’t move the ball, if it doesn’t have possession.

3. Turnovers and penalties. They had seven fumbles, losing three. No interceptions which is a bright spot. The Eagles’ Nick Foles threw one interception and fumbled once, but he recovered it. So the Lions lost the turnover battle 3-1. They also had nine penalties to one for the Eagles. Six of the Lions’ penalties came in the fourth quarter.

4. The Lions play their next two at home, but the Baltimore Ravens (7-6), the next opponent on Dec. 16, came back for a win Sunday and are 7-6. They’ve won three in a row. 

5. Sunday was a chance to make a statement and that opportunity was thrown away. Good teams, playoff teams find ways to win this type of game. On the Fox pre-game show, Jimmy Johnson said the Lions have enough talent to win it all if they weren’t a sloppy team. He has them pegged.

(Follow @PaulaPasche on Twitter. Order her book,  “100 Things Lions Fans Should Know & Do Before They Die’’ here. It’s also available at bookstores.)