Robin van Persie tension not a problem - Fenerbahce boss Vitor Pereira

Fenerbahce boss Vitor Pereira has played down talk that he has fallen out with Robin van Persie, saying: "Many times in football to win games you need these kinds of tensions."

Van Persie, who joined Fenerbahce from Manchester United in the summer after indicating he wanted regular first-team football, but the Dutchman has been on the bench for Fenerbahce's last two games after a disappointing showing in the 3-1 Europa League loss to Molde.

The pair had appeared to argue on the touchline before Van Persie's introduction in the 77th minute of the 2-1 victory over Bursaspor on Sept. 20, and there were further signs of dissent at the end of Sunday's 3-2 defeat to Besiktas.

Van Persie scored within minutes of his introduction in both those games, though, and Pereira said ahead of Thursday's Europa League tie at Celtic that the tension can drive success.

"I have a great relationship with my team and players," he told his prematch news conference. "Sometimes the tensions are high. We want this team to get better and improve professionally. Robin van Persie is part of the team and we all want to get better.

"Our relationship is based on trust in each other, confidence. We have our objectives. We have a normal relationship. Sometimes high tension stuff happens, but in football we can solve these kind of situations perfectly.

"Many times in football to win games you need these kinds of tensions. If we are all in the calm tone you can't win the games.

"These kind of things are normal to us, the people who work for the club. We live it and forget it, but I understand the press point of view -- you would like to make news about it. It happens fast but we solve it fast too."

Meanwhile, Nani, who also joined Fenerbahce from United in the summer, recalled being substituted at half-time by an irate Sir Alex Ferguson the last time he was at Celtic Park.

The 28-year-old Portugal international was just over a year into his United career when they travelled north in November 2008 for a Champions League group game against the Hoops.

Nani struggled to cope with the physicality of a passionate first half that saw Scott McDonald give the home side the lead, and Ferguson replaced him with Dimitar Berbatov at the break in a game that saw Ryan Giggs net a late equaliser.

"I remember when I played my first game here, it was a little bit hard," he said. "I was too young and the manager was shouting to me every time to be more strong because they were tackling a lot but this is part of the game.

"I have learned a lot and we have to be strong on the pitch. We can expect it to be a little bit of a physical game.

"Some tackles tomorrow is no problem -- the most important thing is that no one goes off injured.

"Celtic is a team who likes to attack when they play at home. They have a very strong mentality from the first minute to the last minute, like in England, so we have to be prepared to play for 90 minutes plus a few more on the same level.

"It is important to start winning in this competition. We had a bad result in the last game but we have to focus on the next task and try to win the game."

Information from the Press Association was used in this report.