Gelendzhik: Sweden's World Cup clash with Germany in Sochi on Saturday will carry extra sporting spice for their defender Martin Olsson because his sister is married to top German basketball player Dirk Nowitzki.

As soon as the draw was made the full back's phone started buzzing with messages from his brother-in-law, who plays for the Dallas Mavericks in the NBA on the other side of the Atlantic.

"He's a big football fan, so there's a lot of football talk in the family," Olsson said.

"We have a family chat on WhatsApp so there's been a good bit of banter... He probably wants Germany to win but it hasn't got serious yet, before the game starts it probably will," he said with a smile.

The 30-year-old was an unused substitute when Sweden beat South Korea 1-0 in their opening match but he has faced Germany before.

"The last two games against Germany when I've been involved, we had a 4-4 game in Berlin (in 2012) and a 5-3 game at home (in 2013) where we took the lead as well (before losing), so there's been a lot of goals from both sides," he said.

"Hopefully at the World Cup it will be the same exciting game for the fans... Of course they'll be the favourites, but in the World Cup upsets can happen, and hopefully that will be one of them."

Germany have already been on the wrong end of a shock result, losing 0-1 to Mexico in their Group F opener, and they will be looking to get their campaign back on track against the Swedes.

"We need to stick together and work hard on the defensive part, and hopefully we can nick a set piece or even a counter-attack, but of course we go into every game for a win," Olsson said.

He is aware of speculation linking him with a move away from his club Swansea City, who have just been relegated from England's Premier League, but said it would not affect his focus.

"The World Cup is always a shop window, but I haven't been thinking of it in that way," he said. "I have another year on my contract with Swansea and I have to respect that. I want to enjoy the World Cup, it's a dream to play for your country."

Olsson said he did not know if Nowitzki, who won the NBA Finals with the Dallas Mavericks in 2011, would be in the stands when the two sides meet in Sochi.

"We thought about having the family coming and watch the games, but we'll see," Olsson said.

Meanwhile, Olsson's teammate, Emil Forsberg said he needed to be more like himself if he was to silence his critics and effectively send Germany home.

"The pressure is on Germany, at the same time we don't want to go in and let ourselves down. We want to show a good side of Sweden against Germany," the 26-year-old said.

Forsberg was kept on a tight leash in their 1-0 opening win over South Korea and, although he may not have had as much criticism as the German side who suffered a shock 0-1 reverse by Mexico, he knows he has more to give in Sweden's engine room.

"I'm pretty good at tackling criticism. I'm calm, I'm secure in myself, I'm fairly calm and stable. I understand that if you write that I was bad when I've been bad, then it's normal," Forsberg told reporters.

A handful of Sweden players trained in the sweltering sunshine on the Black Sea coast on Wednesday. Reuters