It has been a miserable last 12 months for the 25-year-old lock who was tipped as a future British Lion during a rampant World Cup campaign.
Troubled by an on-going groin injury that should have been dealt with far sooner than it was - which Sidoli accepts part blame for - his fall from grace has nevertheless been as perplexing as it has frustrating. Since returning from Australia, he has started just once for Wales in their Six Nations defeat in Ireland last February.
During that time came the bitterness over the collapse of his beloved Celtic Warriors, the ensuing uncertainty and subsequent pressure of a high-profile move to the Blues. Proof that it never rains but pours when you are down.
"It's been a very frustrating year to say the least, probably one of the hardest in my career so far. It's easy to blame the injury but that wasn't everything. There were other factors that I had to get straight in my head," revealed Sidoli. "It took me a while to get back on track for the Celtic Warriors after the World Cup and again when I arrived at the Blues. I spoke to a few people who I respect because I needed to know why I was
starting so slowly and they helped me a lot. Most of them just told me not to push things.
"The move to Cardiff came with a lot of expectancy because of the size of the club and a lot of frustration because I knew I wasn't fully fit. It made things more difficult and was really getting me down.
"There was some confusion as to whether or not I needed an operation or not but in the mean time I was desperate to make a good impression at a new club. I was excited by the challenge but perhaps I was trying too hard and doing too much. When I realised this, things started to get better. I feel as if things are settled now."
They certainly are if last weekend's man-of-the-match performance against Gloucester was anything to go by. A commanding display at the lineout combined with a masterful performance at the heart of the Blues pack, evoked memories of the role he played with distinction for Pontypridd and will have had coach Dai Young beaming with satisfaction.
It will have undoubtedly pleased Wales coach Mike Ruddock as well having kept Sidoli in camp during the Autumn Series despite not featuring on the pitch.
"Mike was pretty honest and told me that I was pretty lucky to even be in the squad for the Autumn Internationals given the form of the other second-rows. Guys like Luke Charteris came through, Michael
Owen was used in the second-row and the move to France has obviously done Gareth Llewellyn a power of good," said Sidoli. "It might sound strange but even that was good to hear. It was nice to know that I was still in people's minds and just being around the rest of the guys helped my confidence.
"I used the time positively and took the chance to make up for the lack of a proper pre-season. I worked and trained hard and now I feel a lot better for it."
Sidoli's slump has been endemic of the Blues failure to find any consistency whatsoever. It is a symmetry that the Blues hope will continue given his apparent revival in form and, more importantly, confidence.
"Gloucester is a tough place to go and play but we were all confident in the potential that is here at the Blues. They had been tipped to win by a hundred points which was something that you just don't like to hear," said Sidoli. "Perhaps we had a point to prove and we responded but at the day we still lost and that was very disappointing. It's going to be another big challenge this weekend."
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.
Wales Sevens head coach Gareth Williams looks back on the Rio Sevens success where he helped GB win silver. He believes the successful campaign is a huge boost to his Welsh squad as they prepare for another World Series, as WRU TV's Graeme Gillespie discovers
British and Irish Lions head coach Warren Gatland will be heading back home to take on the All Blacks next year where for him, success for 2017 is all about going to New Zealand and winning a Test Series.
Last week all roads led to Eugene Cross Park where defending champions Ebbw Vale hosted this season's launch of the Principality Premiership. WRU TV's Graeme Gillespie was there to capture the thoughts of Damien Hudd, captain of Ebbw Vale, and WRU Head of Performance, Geraint John.
Llandovery made it three in a row when they defeated Aberavon in the final of the National Foster's 7s at BT Sport Cardiff Arms Park on Sunday. On another eventful day of sevens, Newport claimed the Plate and the Dragons won the women's crown
Last week saw Cardiff welcome players from around the world for the 21st Golden Oldies Festival. The tournament features players over 35 years of age, and this year's event saw a select few represent the WRU in a 'friendly' against the Wooden Spoon.
Wales Under 18 captain Callum Bradbury is delighted to have seen his side claim a narrow 18-17 victory against a strong SA Schools 'A' side to end the three-match Under 19 International Series in South Africa on a high note.
The Wales U18 squad spent an emotional day in the drug-riddled townnship of Hout Bay. Hout Bay Warriors President Fred Johannes said the visit was 'the talk of the town' and will dream about the day everyday for the rest of his life.
RGC 1404's new head coach Mark Jones is hoping to build 'something special' in north Wales and is already looking forward to the development region participating in the Principality Premiership for the very first time.