It's a fact that 'free' transfers in football are, all things considered, quite expensive. Wages, signing fees, agent demands and general costs make any such deal have a sizeable imprint on a club's balance sheet.

Still, Paris Saint-Germain's signing of Gianluigi Donnarumma for a big fat zero in transfer fees sounds like a sensational piece of business – particularly after his Euro 2020 heroics.

The Italy goalkeeper has left Milan, his boyhood club, to join Mauricio Pochettino's side where he hopes to be able to challenge for the biggest club trophies, most obviously the Champions League.

Certainly, Donnarumma is right to aspire to the top prizes. This is a player who made 200 appearances for the Rossoneri by the age of just 21 years and 146 days, who was valued at €170million by agent Mino Raiola when he was just 16.

PSG have secured a bargain, for sure – but is it one they really needed? Incumbent number one Keylor Navas certainly did not seem to think so when he posted to Instagram "gift your absence to those who do not value your presence" shortly after the Donnarumma rumours first emerged.

As Opta data shows, Navas, a four-time Champions League winner, may well have a point.

First, it's important to stress once again that Donnarumma is an excellent signing. PSG are recruiting a highly experienced yet young goalkeeper without paying a transfer fee; a goalkeeper whose market value is only likely to increase over the coming decade – indeed, it has in the past week alone – should Les Parisiens decide to cash in at any point.

However, it's also true that, if the short-term goal is simply to improve the first XI with a view to winning the Champions League, replacing Navas with Donnarumma may not be a fool-proof move.

In 2020-21, Donnarumma kept 14 clean sheets in 37 matches in all competitions. Navas also managed 14 shut-outs, having played in eight fewer games. The Costa Rican conceded only 18 goals in those matches, whereas Donnarumma let in 38.

Donnarumma produced more saves (92) than Navas (74), but the older man's save percentage was far higher: 80.43 per cent, compared to 70.08. In fact, Navas boasted the highest save percentage of any keeper in Europe's top-five leagues last term who started at least 10 matches, a fraction above Atletico Madrid's Jan Oblak (80 per cent). Donnarumma came 25th in those rankings.

Navas' distribution was better, too: his passing accuracy (85.65) was better than that of Donnarumma (77.04), with only three regular keepers in Europe's top-five leagues posting better numbers. Donnarumma did at least surpass Navas for keeper sweepings, which are defined as any time a keeper anticipates danger and rushes off their line to try either to cut out an attacking pass (in a race with the opposition player) or to close down an opposition player: he completed nine of nine such 'sweepings', with Navas on five out of five.

Going further and looking at expected goals on target – a way of building on expected goals that takes into account the quality of the attempt on goal – we can highlight how well these keepers have done to keep high-quality shots on target from going in. This is done by subtracting goals conceded (excluding own goals) from xGOT conceded, giving us 'goals prevented'. And it's another big tick for Navas.

In Ligue 1 last term, if we exclude penalties and own goals, Navas let in 17 goals from an xGOT conceded total of 24.1, giving him a figure of 7.1 goals prevented. In other words, he would reasonably have been expected to concede roughly seven more goals based on the quality of shots on target he faced. Meanwhile, Donnarumma conceded 35 from an xGOT of 34.1, giving him a goals prevented figure of -0.9 – not terrible, but nothing to shout about.

Last season's figures were not isolated, either. If you look back over Donnarumma's 215 club appearances since his Milan debut on October 25, 2015, Navas' consistency as a shot-stopper is superior.

Donnarumma conceded 227 goals for Milan (excluding own goals) in all competitions from an xGOT figure of 244.4, giving him a goals prevented tally of 17.4. That's a strong return – better, for instance, than Manchester United's David de Gea (16.6) and Liverpool's Alisson (16.1) – but, again, it's lower than that of Navas (20.3).

For balance, both of them are a long way behind the top performer in this metric over that time frame. That man, unsurprisingly, is Jan Oblak of Atletico Madrid, with a quite remarkable goals prevented figure of 44.5.

It's as yet unclear what Navas' plans will be now that Donnarumma has moved to Parc des Princes, but a keeper with his pedigree and medal collection is unlikely to settle for a back-up role. And nor should he: Donnarumma might be PSG's future, but Navas does not deserve to be dispensed with in the present.

Ligue 1 champions Lille had just two players named in the competition's Team of the Season, with runners-up Paris Saint-Germain represented by five.

It was an incredible season for Christophe Galtier's Lille, who had finished fourth in the shortened 2019-20 campaign.

A talented squad full of vibrant, youthful attackers – albeit spearheaded by veteran campaigner Burak Yilmaz – clinched Ligue 1 title number four for the club on Sunday, with their success confirmed when they beat Angers 2-1 on the final day of the season.

PSG finished top in the previous three seasons since Monaco's Kylian Mbappe-inspired win in 2016-17.

Indeed, it is only the second time since 2012-13 that the capital club has not won the title… Not that you would know it when looking at the Team of the Season as announced by the National Union of Professional Footballers (UNFP) following the conclusion of the season.

The Parisians dominate the XI with five players: Keylor Navas, Marquinhos, Presnel Kimpembe, Kylian Mbappe and Neymar.

The only two Lille players to be included in the selection were left-back Reinildo Mandava and Benjamin Andre.

Yilmaz in particular will have every right to be disappointed by his exclusion, with the veteran Turkish striker only outscored by Cristiano Ronaldo (29) among players over the age of 35 across Europe's top five leagues.

His penalty on Sunday, which ultimately proved to be the goal that sealed Lille the title, was his 16th in Ligue 1, a haul bettered by only Mbappe, Monaco's Wissam Ben Yedder and Lyon star Memphis Depay.

Yilmaz is performing well in excess of his expected goals (xG) figure of 9.97. A positive differential of 6.03 is the sixth-best in the elite divisions behind Robert Lewandowski, Marcos Llorente, Son Heung-min, Luis Muriel and Lionel Messi.

Similarly, goalkeeper Mike Maignan may feel a slightly hard done by, his 21 clean sheets two better than anyone else across the top five leagues.

Although, using the xGOT (expected goals on target) conceded model, Navas (8.1) is one of the three goalkeepers in Europe's top leagues to have prevented more goals than Maignan (5.8).

Either way, Lille may not even notice the team has been announced as they look set for a long night of celebrations at the end of a momentous campaign.

Hirving Lozano's last-gasp header earned Mexico a 1-0 friendly victory over Costa Rica on Tuesday.

Costa Rica's goal lived a charmed life throughout the meeting in Austria, though it appeared Keylor Navas and company had done enough to keep Mexico at bay.

Indeed, Mexico's luck seemed out when Lozano and Orbelin Pineda both hit the crossbar in the 73rd minute, either side of Paris Saint-Germain goalkeeper Navas making a superb stop on the line to deny Hector Moreno.

Yet fortune ultimately favoured Gerardo Martino's side – who had 18 attempts but only hit the target three times – with Lozano turning in Luis Romo's flick-on in the 89th minute before a dreadful miss from Allan Cruz at the other end settled the contest.