Vidal joined Bayer Leverkusen in 2007.

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Chelsea have been linked with a late bid for Bayer Leverkusen midfielder Arturo Vidal, as Juventus close in on the £12m-rated Chile international.

Vidal, who recently represented Chile in the 2011 Copa America, scored 10 goals for the Bundesliga runners-up last season. Despite also being linked with Arsenal, the Daily Mirror reports that Andre Villas-Boas has expressed an interested in signing the 24-year-old as the club seek a replacement for the injured Michael Essien.

Leverkusen sporting director Rudi Voeller said, "Arturo is a highly-coveted player, there are many clubs who want to buy him.

"We will only sell him in the summer when an offer that we deem appropriate comes."

Meanwhile, Manchester City look set to beat Chelsea to the signatures of two top summer targets.

City manager Roberto Mancini is set to offer £18m for Anderlecht's teenage striker Romelu Lukaku, the Metro reports.

Inter Milan and Paris Saint Germain are also interested in the 18-year-old, with Chelsea the only club to have submitted a cash bid. But Lukaku remains unconcerned with the level of attention surrounding him, saying "I'm keeping a cool head. Normally I train and I play my game. If I thought too much or if I was holding back, it would be the best way to hurt me."

Sergio Aguero, another reported Chelsea target, also appears set to join City with the club ready to lodge a £39m bid for the Atletico Madrid striker.

"I slept last night and I had a game to prepare for today so I don't know any more," Mancini said. "The clubs are talking. They only have one number and it does not work at the moment."

But Frank Lampard is unconcerned by the club's relative inactivity in the transfer market thus far and believes the current squad is good enough to challenge for honours this season.

A 26-man Chelsea squad landed in Kuala Lumpur on Sunday, ahead of the club's south-east Asia tour, with on-going speculation surrounding their pursuit of Luka Modric, Romelu Lukaku and Scott Parker. And Chelsea's temperance in the transfer market appears in stark contrast to rivals Manchester United, who have spent heavily on Ashley Young, David de Gea and Phil Jones.

"They have been very active and spent fortunes on good quality players but we know we have a very good squad," Lampard told The Guardian. "But the manager wants us to come here [south-east Asia] so he can evaluate what he's got. We are going to be very strong next season and, however much Manchester United spend, we still believe in ourselves."

However, Chelsea manager Andre Villas-Boas said he did not expect new signings to arrive during the club's two-week tour. "We do not have the same sense of urgency that you are trying to put on me," Villas-Boas told reporters. "It is a big 15 days and then we will go to the market and do some proper business. The market has plenty to offer but we have to decide on our needs. The players here with us are top quality. By the time we go to the market we will know exactly what we need."