#3 Reims

Wolves aren't the only club to go from promotion to dreaming of European nights in a matter of months. After winning Ligue 2 last season, Reims are 6th, tied with Marseille but behind on goal differential. There's a jam-packed race for the final Europa qualifying spot, but Reims are making a fantastic return to France's top flight, after two seasons in the second division.
Despite losing Jordan Siebatcheu to Rennes and Ligue 2 Player of the Year Diego Rigonato to Al-Dhafra SCC, Reims bolstered their squad and readied it for the demands of France's top tier. Ghislain Konan joined for a club record fee, while Thomas Foket and Bjorn Engels arrived to supplement Edouard Mendy and Yunis Abdelhamid in defence. That defensive solidity has kept them in the race for Europe; only Paris Saint-Germain and Lille have conceded fewer goals in Ligue 1 than Reims.
They've had an excellent run of form too, having beaten 7th-placed Montpellier, 9th-placed Rennes and 5th-placed Marseille this month, as well as impressive draws against Lyon and Lille earlier on. In fact, they haven't lost a league match since December 5 against Toulouse.
Several key signings have started to reach top form during the right time, including Tristan Dingomé. After recovering from injury, Dingomé has played a key role in Reims' uptick in form, more than validating the €1 million transfer fee that Reims paid Troyes for him last summer.
Throw in the tough-tackling Alaixys Romao, who has added plenty of steel in midfield, and you've got a well-built side capable of upsetting the usual suspects en route to securing Europa League football. Reims also reinforced in January, bringing in Chelsea's Abdul Rahman Baba on loan to replace the injured Konan, and, most intriguingly, Arbër Zeneli, who tied Konan's club transfer record fee.
While at Heerenveen, Zeneli was among the top creators in Holland, racking up 9 assists before his January move. The young Kosovan attacker has already amassed two assists in his past two games at Reims, adding plenty of creativity to the side.
Fresh from promotion, Reims are already taking on France's heavyweights - and winning.