Pochettino and Neymar will try to lead PSG to a second league titleLille shocked Europe football when they won the first title since 2011 by ending Paris St-Germain's Ligue 1 dominance.France has seen a summer of managerial speculation, large arrivals, and possibly costly departures. This set up an interesting battle for the next few months.BBC Sport examines some of the key issues as the season begins this weekend and whether Paris St-Germain can rebound from a disappointing past campaign.Lille beat PSG in Sunday's curtain-raiser, the Trophee der Champions. But is this a sign for what is to come?Pochettino gets second chanceAfter a long and successful career as a PSG player, Mauricio pochettino felt like a good manager. However, he has had to deal with many challenges since replacing Thomas Tuchel in January.He won his first managerial trophy just 11 days after he took office. It was a 2-1 win over Marseille in a delayed Trophee der Champions.Lille's fairytale success has put pressure on the ex-head of Tottenham Hotspur, who was even rumored to be returning to North London.After a stunning dismantling Barcelona in the Champions League last 16, he will have the chance to show his team what they can do. He signed a new contract to 2023 in June and has made some big-name signings. However, it could end in a draw.Sergio Ramos is just one of many stellar signings to the Parc des Princes this SummerPSG welcomes big arrivalsIt is evident that chairman Nasser Al Khalaifi has bigger goals than just domestic dominance when he looks at PSG's early transfers business.Les Parisiens have added three excellent players to their team on free transfers: Sergio Ramos (long-serving Real Madrid player), Georginio Wijnaldum (ex-Liverpool midfielder) and Gianluigi Donarumma (Euro 2020 Player of The Tournament). They also acquired Achraf Hakimi, a full-back from Inter Milan.PSG look stronger than ever as they seek Champions League glory with striker Kylian Mabappe likely to stay, despite his contract expiring next summer. Neymar is motivated to succeed in France.They lost the 2020 final against Bayern Munich, before being defeated by Manchester City in the semi-finals last season. They already look stronger, more powerful and more efficient.James Horncastle, a European football expert, told BBC Radio 5 Live that Paris is having a great year. We've seen all their moves. They want to push for the Champions League."Lille celebrates a first title after 10 years of hard work with their fansLille loses momentum in the title defense?It is difficult to match the team's achievements when a team has surpassed its weight. Their squad is soon dismantled by the top clubs that are trying to lure their best players. It is difficult to resist a sale when Ligue 1 teams are still in financial difficulty due to a broadcasting rights problem.Although Lille midfielder BoubakarySoumare has been signed by Leicester City, defender Sven Botman as well as Renato Sanches (who starred for Portugal at Euros this summer), have many admirers. It would be a good idea to keep Jonathan David, a Canadian striker, and Jonathan Ikone, a French international, in your sights.After four years at the Stade Pierre-Mauroy, Christophe Galtier, manager of Nice has also left. Although Burak Yilmaz, a 36-year-old striker who scored 16 league goals last season, has been retained, Lille will struggle to retain their title, particularly with Champions League commitments.Eduardo Camavinga, Rennes' midfielder, is one of the most sought-after properties in the world.What can we do to make sure that this is not the end?Marseille will want to improve after finishing outside of the top four, and manager Andre Villas Boas resigning due to transfer disputes.Jorge Sampaoli, a former Chilean and Argentina boss, is now in. Matteo Guendouzi, William Saliba and William Saliba are both on loan from Arsenal. Cengiz Under, a winger, has also been loaned to Roma from Leicester after a difficult spell.Monaco came third last year and will now be trying to win their first title in five decades. They cannot be overlooked with exciting young players like Sofiane Diop and Aurelien Tchouameni in midfield, paired with experience in the form of Cesc Fabregas as well as a clinical goalscorer in Wissam Benjamin Yedder.Rennes is home to the most promising prospect in the country at the moment. They will have to fight for Eduardo Camavinga, a teenager who rejected a new contract with Real Madrid and Manchester United. Rennes will join Lyon with Peter Bosz, their new boss, but not Memphis Depay. Nice will also be in the race to get a European spot.Only two sides will drop to the bottom. Clermont was promoted to the top flight last season for the first time in the team's history. Troyes, who were Ligue 2 champions last season, will try to avoid the same fate.