The 24-year-old, who has won three caps since making his debut in 2019, has established himself as a fan favourite at Kingsholm since arriving at the club.
Singleton started his career as part of the Saracens Academy, but joined Worcester Warriors ahead of the 2014-15 season where he made his first team breakthrough.
He was capped by England U20s and named as Worcester’s 2016/17 Young Player of the Season, earning a call up to Eddie Jones’ England squad, playing against the Barbarians in a non-capped international and touring Argentina and South Africa in successive summers.
He moved back to Saracens ahead of the 2019-20 season and earned his first England caps in the home and away Rugby World Cup warm up matches against Wales, and appeared as a replacement against the USA in Kobe in Rugby World Cup 2019.
There have been a lot of major transfers across the world in the last year — but which last-minute signings rank among the worst?
1.Niki Goneva (Harlequins)
Described by the club as ‘a real coup’ and ‘deadly finisher’ when the winger joined from relegated Newcastle Falcons last summer. However, the 35-year-old, who has been a prolific try scorer throughout his career didn’t cross the whitewash in his six Premiership outings for Quins before leaving to join Stade Montois, who are in the second tier of French rugby union.
2. Dan Carter (Blues)
Arguably the greatest fly-half to ever play the game, fans were excited to see Dan Carter join The Blues to star alongside Beauden Barrett. However, due to a niggling injury, the 38-year-old was a glorified waterboy during his time with the franchise, failing to make a single appearance.
3.Tyrese Johnson-Fisher (Bristol Bears)
Rugby's first viral superstar as a teenager, this signing was more disappointing than bad. The speedster, who is famed for scoring four tries at Twickenham in the NatWest Schools Cup, joined Bristol last summer but left the Premiership side with immediate effect in February. He’s since revealed he’s taken the decision to pursue other opportunities outside of professional rugby.
4. Sean O'Brien (London Irish)
London Irish again wasting money. They parted with £450,000 per season to land the experienced Ireland international. Due to a hip injury, the back-rower made just one appearance in a 39-0 defeat against Sale Sharks before the league was suspended. So far he's played just over 260 minutes for the Exiles.
5. Mark Wilson (Sale Sharks)
This loan move seemed to make perfect sense, but due to a number of factors it hasn’t really worked out. Undergoing knee surgery immediately following the 2019 Rugby World Cup, Sharks fans didn’t see him debut until a 30 minute cameo against Saracens in early February. Recalled by Eddie Jones for the Six Nations after making just one start for Sale, his time at the club was ended by the Covid-19 lockdown.