The Champions League runners-up summer signing has been made to feel welcome at his new club after completing his £13 million move from Saint-Etienne
And it seems the striker is fitting in well at his new club both on and off the pitch, having already scored a goal against Bursaspor and struck the post against Basel during pre-season.
"It's not hard to understand world-class players," the 24-year-old told the club's official website. "You don't need to play with each other for years.
"I've been welcomed very warmly," he continued. "Everyone's very, very attentive, and I feel like [I'm] at home.
"[Moving to Germany] was an easy decision for me as Borussia Dortmund are a very, very, big club. Playing here will help me become a great player."
The Gabon international's speed has already excited members of the Ruhr giants' staff, after he ran 30 metres in 3.8 seconds; just shy of Usain Bolt's time over that distance in his 100 metre world-record run (3.78 seconds).
"Pierre is certainly one of the fastest players that has played here," sporting director Michael Zorc said.
Meawhile, BVB midfielder Sven Bender has urged his side to tighten up defensively next term, having conceded 42 goals last season - only five shy of the two prior campaigns combined.
"We don't have to change our game, but we need to optimise it," said the 24-year-old. "Being compact has always been our strength.
"If you concede fewer goals, you have to score fewer goals to win... That's why we need to focus on the defence and play with discipline. Then we have a chance of beating any team," he added.