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Celtic swoop for Mubarak

Celtic completed the loan signing of Ghana winger Wakaso Mubarak on a day in which their transfer policy came under fire following their failure to qualify for the Champions League.

The 24-year-old, who played at the World Cup finals, arrives on a one-year loan deal with Celtic having the option to buy the player from Russian side Rubin Kazan.

He is Ronny Deila's fifth signing of the summer but Celtic have still to pay a transfer fee since Neil Lennon quit as manager.

Free agent Craig Gordon was Deila's first signing before Cardiff forward Jo Inge Berget, Manchester City defender Jason Denayer and Aston Villa winger Aleksandar Tonev arrived, all on loan.

Former Espanyol and Villarreal player Wakaso was set to sign before the first-leg draw against Maribor but work-permit issues held him up until after Celtic crashed out of the play-offs with a 1-0 home defeat on Wednesday night, which sent them into Friday's draw for the Europa League group stage.

That defeat might have an impact on their bid to buy Sporting Gijon forward Stefan Scepovic.

The Serbian has been quoted as saying he has several options other than Celtic, including PSV Eindhoven, but Hoops manager Deila said after the home defeat by Maribor that discussions were ongoing.

Celtic's transfer policy has come under ever-increasing scrutiny over the summer with criticism exacerbated by their 6-1 aggregate defeat by Legia Warsaw, which was overturned following an administrative error by the Poles, and now the loss to the Slovenians.

Celtic have taken in more than £30million in transfer fees since the end of the 2012-13 season, during which time they beat Barcelona.

But their failure to obtain adequate replacements for the likes of Gary Hooper, Victor Wanyama and Joe Ledley has now seen them miss out on Champions League income of about £15million.

However, despite criticism of a lack of spending this summer, they have shelled out close to £15million on players since May 2013, but with limited success.

Only Virgil van Dijk has looked like fitting Celtic's recent ideal profile of a young foreign player who develops at the club and is then sold on for a profit.

The Dutch defender arrived for a fee of about £2.6million and has been linked with an £8million switch to the likes of Newcastle and Southampton.

Others who have come in for similar fees have failed to make their mark - Portuguese forward Amido Balde, Finland striker Teemu Pukki, Dutch winger Derk Boerrigter.

Norwegian midfielder Stefan Johansen has made more of an impact but could not help Celtic overcome Champions League opposition they would expect to beat, while Israeli midfielder Nir Bitton and Australia's Tom Rogic have failed to add to the team.

While Wanyama and previously Ki Sung-yueng made the club a huge profit there were also earlier abject and expensive failures including the purchases of Mo Bangura and Efrain Juarez.

Celtic's wage structure has prevented them signing more expensive players but former Celtic striker Andy Walker believes the club should look closer to home.

The only Scot to arrive before Gordon in recent years has been Leigh Griffiths, who has struggled to win over Deila after scoring seven goals last season after joining from Wolves in the final moments of the January transfer window.

Walker told Sky Sports News: "They're now bringing players in from every corner of the globe.

"There's a certain market that they look at and they're not prepared to pay any serious money for anyone with a bit of pedigree and I think that's the thing that frustrates Celtic fans most.

"This is a club, that even without Rangers in the league, should be looking after their own and being strong, building slowly but surely and getting players in of quality.

"When you see the amount of mistakes they've made in the transfer market - Amido Balde, Efrain Juarez - and the loan system they use continually, they ignore all the Scottish talent, the likes of Johnny Russell who goes to Derby and Andy Robertson who goes to Dundee United and then Hull.

"They're ignoring the market that's right on their doorstep."

And Walker feels Celtic have paid the price for their failure to back Deila.

"It's really depressing that Celtic didn't make a really strong case for their manager," he said.

"They didn't back him with the signing of players. They consistently lose their best players and it's a huge disappointment for the supporters. It's a real kick in the teeth for them.

"Celtic right now are very much a selling club and if they get a semi-decent offer for Van Dijk I think they're more than prepared to sell him.

"They know, despite the disappointment of last night and dropping into the Europa League, they still have a squad that is strong enough to win a league title.

"I just hope they make better provisions as they move into this season and with the transfer window in January - I hope they make provisions to try and get into the Champions League next season because that is where the club belong."