With the summer transfer window proceeding in full flow, La Liga has witnessed the completion of signings amounting to up to €249m till date.The financial predicament caused due to the ongoing pandemic seems to have impacted the Spanish top-division the most. With a cumulative transfer sum of less than a quarter of a billion, La Liga ranks dead last among the top five European leagues in terms of summer business.Unsurprisingly, the Premier League sits comfortably at the top, boasting a cash flow of over €1b. Nevertheless, some enticing signings have been fabricated by the Spanish clubs, in an attempt to reclaim their status as Europe's best.In addition to new signings, La Liga also witnessed notable departures2021 has been a bizarre year for the heavyweights in Spain. Lionel Messi was ousted from his home for 21 years after La Liga's strict financial regulations prevented Barcelona from re-signing their talisman.In a similar scenario, their arch-rivals, Real Madrid, lost both of their first-choice center backs in a single transfer window. While a long-time servant, Sergio Ramos, departed the club due to contractual disputes, his counterpart Raphael Varane was lured into signing for Manchester United for a cut-price fee of €50m.How can PSG give Neymar €30M per season, while paying €60M for Hakimi and €75M in pre-tax wages to Messi, Donnarumma, Wijnaldum, and Ramos, and even *think* about re-signing Mbappe in the same year it's expected to lose €204M in revenue? UEFA, just end the charade.— Anthony Lopopolo (@sportscaddy) August 6, 2021During this year's summer transfer window, clubs have moved into the final segment with one sole agenda: to solidify as many positions as they can in their teams. Even so, many La Liga squads have already started shaping up for next season, incorporating their new signings all the while adjusting to the loss of former stalwarts.Keeping that thought afloat, here are 5 incoming signings in the Spanish top-tier who you should keep an eye on in 2021-22:#5 Erik LamelaAnother one of free signings, Lamela will make his La Liga debut for SevillaOne of the many signings made by Tottenham using the 'Gareth Bale money', Erik Lamela arrived at White Hart Lane as a 21-year-old prospect, brimming with uncharted potential. Fast forward eight years and the Argentine finds himself being used as a bargaining chip to acquire another 20-year-old winger with loads of potential.Constant injury problems and a lack of consistency meant that Lamela could never find his footing in England. He was pushed further down the pecking order by the arrivals of Lucas Moura and Son Heung-min, who are now mainstays for Spurs. The Argentine winger was subsequently transferred to Sevilla this summer after 257 appearances for the club.Erik Lamela has been presented at the Ramon Sanchez-Pizjuan Stadium after his move to Sevilla. pic.twitter.com/jbNqmlzJ6s— Trust Sports (@TrustSportsNews) August 3, 2021Nevertheless, Lamela has always shown a presence of flair in his game, whenever he has stepped on the pitch. The 29-year-old attacker arrives in La Liga with a huge point to prove and nominal room for error. With Sevilla, Lamela has been given one final chance to rediscover his best form, which made Spurs fork out €30m on him as one of their seven signings in 2013.#4 Rodrigo De Paul (Atletico Madrid)De Paul has caught much attention in this season's signingsCommanding €35m amongst all the other low-cost signings this season, Rodrigo De Paul will be arriving in Madrid for a second spell in La Liga. The recently crowned Copa America champion spent two years at Valencia, making just 44 appearances during his first La Liga stint. He was subsequently loaned out to his boyhood team, Racing Club, on the orders of then-manager Gary Neville.La Liga clubs have made just three signings for transfer fees north of €10m this summer: Rodrigo de Paul (Atlético Madrid), Boulaye Dia and Juan Foyth (Villarreal).@RegaloJnr on why Atlético’s €35m Argentine could be one of the bargains of the year. https://t.co/cYUBpetArZ pic.twitter.com/s5zvJlCN4g— Breaking The Lines (@BTLvid) August 9, 2021After failing to make his mark in La Liga, a transfer to Udinese revived the Argentinian's career. De Paul's form in Italy caught everyone's eye and he was eventually called up to represent his national team in 2018. Following a prolific 2018-19 season in Serie A, which saw the midfielder finish as Udinese's top scorer with nine goals and nine assists, De Paul was made club captain in 2020.The creative playmaker carried Udinese to a respectable mid-table finish in each of his five seasons at the club. Hence his transfer to current La Liga champions Atletico Madrid is among the most deserved signings of 2021. It would be interesting to see how Diego Simeone brings the best out of the latest of his signings at the Wanda Metropolitano Stadium.Also read: 5 iconic Lionel Messi goal celebrations for Barcelona