The 20-year-old joined Celtic on a season-long loan last season and during the summer signed permanently at Parkhead. Timothy, 18, joined Celtic on a six-month loan deal.
Weah knew about the Glaswegian club from his father, the legendary George Weah, who played against Celtic, and both parents, George and Clar, have followed the career of Celtic manager Brendan Rodgers.
The new arrivals are a welcome boost for Rodgers after a frustrating first half of the season which saw main goal threat Odsonne Edouard struggle with injury and consistency, while Leigh Griffiths is taking time away from the game to concentrate on personal issues.
Weah, who scored in the Trophée des Champions and one of two Ligue 1 matches for PSG in August, isn't put off by the talk of his father.
A deal to sign American left-back Gutman was agreed last night and he's set to return to Glasgow to finalise details of the transfer.
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Gutman is likely to be brought in as an understudy to Kieran Tierney, with Emilio Izaguirre out of contract this summer.
Celtic manager Brendan Rodgers has claimed the Bhoys have forced the other sides to raise their standards in the Scottish Premiership so far this season.
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A couple of boys had maybe not played in that game before, it maybe gives everyone a bit more experience going into the next one and hopefully we can do better.
Christie is now a crucial part of Rodgers' XI this term and Morgan should look to follow his example.
Once again Sunderland have taken an interest as well as Steve Clarke at Kilmarnock who may look to bolster his defensive options and work with Hendry. 'We will be looking to get them out on loan to get them games.
The 21-year-old winger is the most expensive Scottish signing after West Brom bought him for just under $20 million from RB Leipzig.
But Rodgers insists Scotland pair Hendry and Morgan still have a future at the club despite limited first-team exposure in recent months.