Portuguese international midfielder Maniche has completed his loan move to Premiership champions Chelsea.
The 28-year-old joins from Russian side Dynamo Moscow until the end of the season and is eligible to play in the Champions League knockout stages.
Blues boss Jose Mourinho has indicated that Maniche will be Chelsea's only recruit in January.
He said: "We will sign nobody or one player in the window. If we sign one player he will be a midfield player."
Mourinho's need to further bolster his midfield heightened following Michael Essien's injury during the Blues' 3-1 triumph at West Ham on Monday.
He added: "We have Essien suspended and injured and we lose Geremi to the African Nations Cup. He is also a solution in midfield."
Maniche admits he can't wait for the deal to go through. He said: "I have had offers from other big European teams but once Chelsea became interested there was only one team."
Maniche has already played under Chelsea manager Mourinho when at Benfica and Porto. And the midfielder says his presence at Stamford Bridge was an important factor in the switch.
"Mourinho is the key to me signing - he has been after me for some time. He is my maestro. He knows me from my time at Porto and Benfica.
"I would be crazy to turn them down, because of the manager and because I have known some of the players there for years."
If Maniche proves a hit at Stamford Bridge, Chelsea could make the move permanent in the summer for £5m.