Now the teams couldn't be further apart.
The Broncos (9-3) are riding a seven-game winning streak into Thursday night's game in Oakland having already wrapped up the division title. They are spending the last month worried about playoff positioning and staying healthy for the postseason.
The Raiders (3-9) have lost five straight and have been eliminated from playoff contention for a 10th straight season as the franchise has regressed in the first year of the new regime led by general manager Reggie McKenzie and coach Dennis Allen.
"It's definitely disappointing. Coming into the season, we had a new GM, had a new coaching staff and it felt like the sky was the limit, but for some reason obviously, we had a lot of injuries but for some reason, we haven't been on the same page the whole season," defensive back Michael Huff said. "The defense has had their struggles, the offense has their struggles at times, special teams had their struggles at time. It's like we haven't just put that complete game together yet. We're just trying to figure it out and find that perfect game."
The Broncos figured it out quickly after going 8-8 last year in their first season under front office boss John Elway and coach John Fox. The biggest change came when they acquired quarterback Peyton Manning to replace pedestrian passer Tim Tebow.
But nearly 20 other players acquired since Elway took over the football operations have started games this season, including standout defensive star Von Miller, who has 26 1/2 sacks in less than two seasons.
"It's been a lot of hard work by a lot of people whether it's personnel department, the coaching staff, the players in the locker room," Fox said. "As far as the offseason I know a lot was made of Peyton Manning but we had a lot of other guys that have been big contributors to this football team as well. But, you know, anything worth a darn takes time to build and so we just in year two of that process."
The acquisition accelerated it. He has come back from a neck injury that sidelined him all last season to set a Denver record with 29 touchdown passes.
The addition of a dangerous passing game to complement a strong defense led by pass rushers Miller and Elvis Dumervil and a solid running game have made the Broncos legitimate contenders in the AFC.
They clinched the division last week and are tied with New England and Baltimore for second place in the conference and a first-round playoff bye.
"I think our team realizes what a unique opportunity we have and we are trying to take advantage of it," Manning said. "Those are the kind of guys you want to be around."
It might be natural for the Broncos to overlook the struggling Raiders team that hasn't led a game at any point the past four weeks, especially with a potentially key playoff positioning game the following week in Baltimore.
But with big-play running back Darren McFadden expected to return and the intensity of a division rivalry, Fox has preached all week to his players to avoid that trap.
"You can't look at their record; you've got to look at their film," safety Rahim Moore said. "They have big-time playmakers. They have speed all over the field, a great running back in Darren McFadden. ... Even though this is a team that's shuffling on paper, that doesn't mean they can't make plays. Just because we've been winning doesn't mean they're going to give us a victory. They're going to come play us hard. It's the NFL. Don't ever take anybody lightly in anything you do."
The Raiders will be playing the game with heavy hearts. Allen, the defensive coordinator in Denver last season, has been away from the team all week because the death of his father, Grady.
The players have talked about rallying behind their coach this week. They are searching for any kind of motivation after all their real goals disappeared during the five-game losing streak.
"You just play for pride," Huff said. "We don't want to go out there and get embarrassed Thursday night. Our family, friends, high school coaches, little league coaches, everybody will be watching us. If you don't want to not get embarrassed you shouldn't be playing this game."
AP Pro Football Writer Arnie Stapleton in Englewood, Colo., contributed to this report