Watson has racked up 165 metres from 31 carries in the tournament so far and has proven to be a disruptive influence at the breakdown, while Hogg showed his finishing ability and devastating pace with the breakthrough try against Italy.
Les Bleus will be looking to maintain their 100 per cent record in the tournament as they go in search of a first title since 2010.
Galthie told Six Nations Rugby’s official website: “This formidable Scotland team will cause us problems at home.
“They are able to create chaos with a movement of the ball, the length of the passes and acceleration of players like Hamish Watson or Stuart Hogg.
“They have an organisation around the ball which is able to destabilise almost all the teams in the world. And they do it regularly.
“This is a team to take very, very seriously. There is no easy match in Edinburgh.”
Galthie has made two changes to his starting line-up for the clash at Murrayfield, with Damian Penaud coming in for Teddy Thomas on the wing, while Jefferson Poirot returns at loosehead prop in place of the injured Cyril Baille.
“Damian came back to work with us on the third game. He did excellent training and regains his starting position,” said Galthie.
Galthie has no issues about bringing Poirot back in and added: “He has experience. He has very important assets. His qualities as a rugby player are indisputable. We have total confidence in him to support us.”
WATCH: Jim discusses the ramifications of the Six Nations going behind a pay wall and no longer being shown on free to watch TV.
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