Six goals in 15 games in Scotland led to his loan being cancelled in the middle of last season, with Biereth sent to Strum Graz for the second half of the campaign.
Mika Biereth hit a stunning treble to help give Monaco a 7-1 win over Nantes on Saturday, his second hat-track since joining the Ligue 1 club last month.
There was more than a hint of irony that on a weekend when Arsenal were deploying Mikel Merino as an emergency striker, one forward the club let go was scoring a hat-trick to reach 20 goals for the season.
Biereth managed 14 goals for Strum Graz in the first half of the season before joining Monaco for over £10million.
Biereth joined Arsenal in 2021 after impressing for Fulham, where he scored 21 goals in 21 games for their Under-18 side.
