Bayer Leverkusen captain Simon Rolfes believes further investment is needed in the team to cope with the double responsibility of Bundesliga and Champions League football next season.
Leverkusen qualified for the group stage of the Champions League by finishing behind Bayern Munich and Borussia Dortmund in the league, but they have lost Andre Schurrle and Dani Carvajal this summer.
Heung-Min Son and Giulio Donati have been brought in as replacements, but Rolfes is worried about a possible drop in quality when the club actually need more strength in depth next season.
"The quality of the team has got to get better than last year if we want to be successful in the Bundesliga and the Champions League, or else it will be tough," he said in the Rheinische Post newspaper.
"We have lost players who we could rely on to be able to play consistently at a high level, but you never know what to expect with new players."
Leverkusen made Emir Spahic their third new signing this summer on Friday with the Bosnian central defender increasing competition for places at the back.
"He is going to help us realise our goals in the Bundesliga, DFB-Pokal and, of course, also in the Champions League," said the club's director of sport Rudi Voller.
The 17-year-old Slovenian has been making quite a name for himself in his homeland - allowing him to draw admiring glances from afar.
Zabret made his senior debut in the Slovenian Premier League last season at the age of just 16.
His potential was noted by a number of clubs, and he took in a spell training with Swansea in January.
It is understood that they have now fended off interest from sides across Europe to strike a deal with Domzale.
Zabret is expected to fly into the UK on Monday to finalise personal terms before flying off to Holland with the rest of the Swans' first team squad later in the week.
Paulinho is currently playing a starring role for his country, heading in the winning goal against Uruguay to help Brazil reach the final of the World Cup warm-up event.
While he is focused on tomorrow's clash with Spain at the Maracana, Paulinho is almost certain to leave Corinthians this summer and Spurs would be his preferred destination.
The 24-year-old said earlier in the week that the north London club had tabled a bid for him, and admitted White Hart Lane is a desired option as he would relish working with boss Andre Villas-Boas and the influential Gareth Bale.
"It is important for the team and for the Brazilian fans that at the moment all my focus is on winning the Confederations Cup," he said in the Daily Mirror.
"But after the tournament is finished I hope it is a deal that can get finalised quickly.
"To play in England for a great team like Tottenham is a dream. What I respect about Tottenham is the ambition they have shown.
"This summer there has been interest in their coach and their best player - and they have been clear they are both not going anywhere."
