Argentina international striker Gonzalo Higuain will not leave Napoli this summer, according to club president Aurelio De Laurentiis.
Higuain has been linked with a move to the Premier League, with Chelsea, Arsenal and Manchester United thought to be keen to acquire the 27-year-old's services.
The former Real Madrid star has three years left on his contract with Napoli and the Serie A club have no intention of letting him leave.
"There is absolutely no chance that Higuain will leave," De Laurentiis told Italian TV station Mediaset. "Gonzalo is a Napoli player.
"I have made his (release) clause clear in order to stop the constant speculation that appears in the press.
"There is a precise clause."
Napoli paid Real Madrid (£28million) to sign Higuain in the summer of 2013 and any potential suitors would have to splash out £66.8million, Higuain's release clause, to acquire the player.
Pepe Reina has returned to Napoli on a permanent basis after leaving Bayern Munich.
The former Liverpool goalkeeper, who spent a year on loan at the Stadio San Paolo in 2013-14 before moving to the German side, is now back in Italy.
"Pepe Reina is a player of Napoli," Napoli announced on their website.
"The Spanish goalkeeper had a medical at Villa Stuart this morning, accompanied by team doctor Dr De Nicola, and then signed the contract with President De Laurentiis."
Terms of the deal were not disclosed.
Bayern Munich goalkeeper Jose Reina will undergo a medical in Rome on Tuesday as he closes in on a return to Napoli.
Reina, 32, played for Napoli in the 2013-14 campaign on loan from Liverpool before joining Bayern Munich on a permanent transfer last summer.
Napoli will only consider selling Argentinian striker Gonzalo Higuain to Man Utd or Arsenal this summer if they agree to pay his £72m release clause.
Higuain, who is currently competing with Argentina at the Copa America, has been strongly linked with a move to England.
Premier League sides Manchester United and Arsenal are reportedly eager to acquire the 27-year-old while Atletico Madrid are also in the race to sign Higuain.
"Higuain's future? If a player has a contract this contract has to be respected," Napoli president Aurelio De Laurentiis said to Gazzetta dello Sport. "If a madman arrives and offers to pay his buy-out clause then one must consider it.
"Otherwise Pipita (Higuain) will remain here."
Twitter user @Rajigolo shared this picture of a smashed window at the Piebury Corner shop near Arsenal's Emirates Stadium.
Piebury Corner's website shows the shop's facade before the damage:
The Metropolitan Police described the incident as "football-related".
A spokesman said a man had been arrested in the area for a public order offence, unconnected to the damage at Piebury Corner.
A man in his 40s was taken to Whittington Hospital in north London with cuts to his head.
A London Ambulance Service spokesman said the man's injuries were not thought to be serious.
Paul Campbell, owner of the Piebury Corner pie shop, said the attack was "completely unprovoked".
A pie shop near Arsenal's stadium was allegedly attacked by rival Italian supporters before this evening's Champions League match.
Piebury Corner, near the Emirates Stadium in north London, has had to close after dozens of thugs smashed windows, breaking chairs and swinging belts.
Witness Emily Gould, who works at the restaurant, said around 50 customers were inside the premises when a 30-strong mob of rival supporters stormed the building prior to kick-off.
She said: "I think they were Italian men with Napoli colours and scarves tied around their faces. They were shouting something in Italian, chanting and causing trouble down the street."
She said one man had to be taken to hospital with what she believed was a deep gash to the head after he was struck by a swinging belt buckle.
Napoli have been charged over alleged match-fixing in a game against Sampdoria on the final day of the 2009-10 season, the Italian football federation prosecutor said in a statement.
The club, their former third choice goalkeeper Matteo Gianello and ex-footballer Silvio Giusti will go before the federation's disciplinary committee after information was passed from a criminal investigation in Naples.
Sampdoria won the game and entered the preliminary stage of the Champions League.
The development is part of a wide-ranging criminal and sporting probe into illegal betting and match-fixing in Italy which have already led to several arrests and bans.