Chelsea's chief executive, Ron Gourlay, has confirmed the club remain in the transfer market despite having already spent in excess of £60 million this summer.
Champions League holders Chelsea have already signed Eden and Thorgan Hazard, Marko Marin and Oscar. The former cost in the region of £32 million while the latter was acquired for around £25 million.
Their spending appears unlikely to stop there, though, as new permanent manager Roberto Di Matteo looks to improve on last season's sixth-placed finish.
Gourlay said: "We are still looking to strengthen in one or two areas. If the right players become available things could develop over the next couple of weeks."
The Blues are keen on Wigan forward Victor Moses, although they have so far seen their offers rejected by the Latics, while Porto's Hulk has long-been linked with a switch to Stamford Bridge.