Krystian Bielik completed his move to Arsenal this week, but expect slow progress.
Arsene Wenger confirmed the midfielder was not up to full fitness this morning at his press conference, and The Telegraph have since added detail on the timescale the midfielder faces.
Their report states: "Bielik will not be considered for another three weeks while he gains full fitness after arriving during what is currently the mid-season winter break in Poland."
To add to that, the teenager only played six games ahead of the break for Legia Warsaw, and will need to adjust for the rigours of the Premier League.
By time he is fit in mid-February, Arsenal will be at a critical point in their season fixture-wise. They face rivals Tottenham in February, as well as resuming their Champions League campaign.
A midweek fixture away at Crystal Palace is not either an ideal time to introduce him. Perhaps one option could be the February 10 game at home to relegation threatened Leicester City, but even then is touch-and-go considering the three-week expectation.
If Arsenal are serious about strengthening their position in defensive midfield in the transfer market, a more senior player who is instantly ready to make an impact.
Given the form of the outstanding Francis Coquelin of late, whether Arsene Wenger is minded to do this at all is another matter.