Newcastle United have completed the signing of Yoshinori Mutō from Mainz 05 after he was granted a work permit.

The Japanese forward becomes Rafael Benitez’ fifth summer signing - joining Martin Dubravka, Ki Sung-yueng, Kenedy and Fabian Schär at St James’ Park.

Muto swaps the Bundesliga for the Premier League after the Magpies paid £9.5 million to acquire his services and puts pen to paper to a four-year deal on Tyneside.

The 26-year-old adds some much-needed firepower in the Newcastle attack having recently sold Aleksandar Mitrović to Fulham for £22 million.

Meanwhile, it is rumoured that a move for West Bromwich Albion’s Salomon Rondon has stalled - and Benitez vented his frustration following Wednesday’s 4-0 defeat to Braga - informing the press 'things are not going well off the pitch'.

Muto – ‘I am honoured’

Muto is the first Japan international to represent the Magpies and he told NUFC.co.uk he is “honoured to be a player for such a big club.”

He then outlined his long-term ambition whilst in the North East and that is to "achieve good results", “perform well” and “leave his name in Newcastle’s history".

All in all, he is “very happy to be a player for Newcastle United” and is “really looking forward to playing in front of the fans.”

Benitez – ‘really pleased’

“I am really pleased to have Yoshinori Muto with us,” said the former Liverpool manager.

Benitez admitted the club had been “following him for quite a while” before stating why he decided to bring the forward to the club: “Hopefully he can bring us his energy and work-rate and help the team to improve and be better for the new season.”

Yet more transfer frustration for Benitez

Having accumulated £40.5 million from player sales so far this summer, Benitez has been granted just £17 million combined for Muto, Dubravka and Schär.

That leaves a £23 million net profit for Benitez this transfer market alone, however, Newcastle owner Mike Ashley is unwilling to release the funds the Spaniard raised.

And post-match quotes from Benitez following the loss in Portugal - suggests the 58-year-old has reached boiling. This followed shortly after the United players chose not to speak to the media.

Benitez revealed: “Things are not going well off the pitch and you can see a reflection of that on the pitch.

“Ten days before the start of the season now and this is wake up call. We have to realise we can’t make these mistakes.

“We will try to change things in the next 10 days. We will try our very best. I have no idea. We can talk and be close but after we’re not so close.

“They [Newcastle fans] have to be concerned. We are concerned.”