On Thursday evening, the transfer window slammed shut, ending one of the craziest summers of spending ever. 

Records were broken all through the off-season, by both Premier League clubs and others across Europe. 

Paris Saint-Germain completed the biggest deal of the window, securing Neymar for a fee of £198 million. 

The French club then signed one of the continents hottest young prospects on loan on deadline day. 

Kylian Mbappe, who had been linked with moves to Real Madrid and Arsenal all summer, has moved from rivals AS Monaco and it's reported that he'll make a permanent switch to Paris at the end of this season. 

In England, spending records were broken for a sixth consecutive year. This summer, teams paid over £1.4 billion for players, which included spending an unprecedented £210 million on the final day.

Of course, this kind of spending has not gone unnoticed. PSG are facing a UEFA investigation after triggering fears over Financial Fair Play, but it's still unclear if they will be punished. 

While English clubs haven't gone as far as potentially breaking FFP rules, they've still come under criticism from a number of big names in the sport.  

Roy Keane has been one of the most vocal critics, calling this summers fees "mind-boggling" for "average players".   

To hammer home his point, he then suggested that his former Manchester United teammate Ryan Giggs would be worth £2 billion in today's market.   

And after hearing what the Irishman had to say on his potential fee, Giggs has responded in great fashion and it appears he agrees with his former Red Devil.

"He's always spoken a lot of sense has Roy!" he told WalesOnline.       

"I don't know about £2 billion but I think Roy's point was that now you're seeing average players go for massive sums."

The Welshman also had his say on Keane's value in today's market and he didn't miss the chance to compliment the midfielder, claiming he was better than N'Golo Kante.

"You couldn't buy him because you look around the league and who is like him," said Giggs. "N'Golo Kante's a fantastic player but Roy's better than Kante. He could do everything."

The former United winger is clearly full of praise for his old teammate, believing he's better than Kante, who is renowned as one of the best midfielders in the league.