10- Junichi Inamoto
Arrived from Japan with a huge reputation, and expectation to match, but made virtually no impact during a year at Arsenal and was quickly moved on to Fulham.
9- Manuel Almunia
It could be argued that Arsenal had worse players and less value for money in the position but, in the period from 2007 until 2010 when Wenger was far too patient with so many players, the case of Almunia was surely the most frustrating.
8- Richard Wright
Having punched the ball into his own net against Charlton then allowed a soft goal to Gus Poyet in the North London Derby, Wright was left fighting even to make the Arsenal bench. He left to join Everton after only one season and 22 appearances, conceding defeat to Seaman and never returning to his early Ipswich highs.
7- Amaury Bischoff
Not a costly blunder, but a very odd one. Bischoff arrived with no pedigree but if Arsene Wenger saw something in him, he must be good, right? Wrong. Played just four games, and now - aged 26 - plies his trade in the German third division.
6- Park Chu Young
Had been on his way to Lille from Monaco before Arsene Wenger suddenly intervened in the summer of 2011. Given the ‘No 9’ shirt, and still at the club, but has played just eight minutes in the Premier League.
5- Jose Antonio Reyes
It might be simplistic to say Phil Neville ended Reyes's Arsenal career - but after Manchester United's terrier niggled Reyes to distraction, his appetite for English football never returned.
4- Francis Jeffers
More 'flop' than 'fox' in the box. Was one of Arsenal's most expensive signings in 2001 at £8 million. Undermined by injuries and scored just four goals in two seasons at Arsenal before rejoining Everton on loan
3- Mikael Silvestre
The French stopper arrived on a free from rivals Manchester United but it was soon clear that there was a good reason why Sir Alex had let him leave. Silvestre looked past his best and was blamed for crucial mistakes in key games against Barcelona and Spurs during his two years with the Gunners. After the 2009/10 season he was released, having played just 26 times in the League.
2- Sebastian Squilacci
A rare Wenger signing in that he joined at aged 30. But this supposed safe pair of defensive hands floundered horribly and was swiftly replaced by Per Mertesacker.
1- Andrey Arshavin
Signed for a club record fee, the man who had lit up Euro 2008 was Arsenal's first huge buy since their move to the Emirates Stadium, and should have been a symbol of new ambition. He confirmed his status as a star with four goals at Anfield, still one of the great individual Premier League performances and was runner-up for the club's player of the season in his first year, despite only having joined in January. But then it all went wrong. Fans seem to be divided on whether it was laziness or the refusal of Wenger to play him in his best position that did for the little Russian. Either way, by the time he was released, Arshavin, once the great hope, was little more than a laughing stock.
Those player did not meet expectation based on their quality and price that makes Arsene Wenger's gamble not worth it. Arsenal need to splash amount of money to them but the return Arsenal get it's not suitable from what club expect for.