Chelsea interim manager Guus Hiddink has suggested the club will be pretty busy between now and the transfer deadline.
Hiddink told his pre-match press conference, as broadcast on the Chelsea website, he admitted it would take a little time for Pato to get up to match fitness.
He told reporters: "He is in London, he was well-spotted. Nowadays there are no secrets.
"He is now in the process of bureaucratic paperwork and we'll see how soon it can solved and he can go on the pitch.
"I think it's not a gamble because coming on loan makes it possible to have a good view on him.
"If you buy those players who must make the next step then it is more of a risk, now on loan it is good for everyone - whether he is happy at this club and whether the club is happy with him."
Matt Miazga was billed as one for the future as he is expected to complete his move from New York Red Bulls, but there were suggestions he could get one or two first team opportunities before the end of the season.
The Chelsea boss also seemed to dismiss the notion of Gary Cahill leaving the club in this window despite his lack of game time, citing a new contract he signed earlier on in the season. Hiddink said he liked the player's attitude and hinted at more game time for the England vice-captain with the fixture schedule getting a little busier for the club.
"I talk to him a few days ago about this situation which I like to do with my key players. He is of big importance and will be regarding the upcoming multitude of games.
"He was very open and very clear that he loves to stay at this club, there was no single space left by him to say 'I'm not happy'. He's happy here of course he's frustrated at not playing but I like his attitude very much."
One man who has been linked with a move away from Stamford Bridge is striker Loic Remy. Hiddink revealed that the Frenchman is currently sidelined with a slight calf problem but suggested that wouldn't be a barrier to any potential transfer taking place.
"We'll see what happens in the upcoming days
"I don't think being injured doesn't have any influence on staying or going. It's a minor injury so we'll see what happens in the coming hours."