The 27-year-old left the Blues for French Top 14 side Toulon in 2014 but his contract expires in the summer.
The Wales international full-back was sat in the stands at the Cardiff Arms Park as the Blues beat the Dragons 27-16 in the Welsh derby on Boxing Day.
"It was great to see him and I know he was quickly back on the plane to his duties in France," Wilson said.
Blues chief executive Richard Holland said earlier in December that they offered Halfpenny a deal to bring him back to Wales.
Speaking after Toulon beat Scarlets in France in the European Champions Cup earlier in December, Halfpenny said he was "weighing up" his options.
"Leigh's obviously got a lot of colleagues and friends from his time with the Blues at the Arms Park," Wilson continued.
"Being home for Christmas I'd imagine with the derby being on his doorstep it was a natural game for him to go and watch."
Halfpenny, who has won 66 caps for Wales, played for Blues for six years before his move to France two years ago.
"I saw him briefly after the game and had a catch up. It's been well documented and I think everybody would like to see Leigh back in Wales," said Wilson.
"Those things are very much ongoing."

The man, named as 24-year-old John Santos Gurgao from Brazil, swallowed 0.8kg (1.8lb) of the drug, the Irish Times reported.
It is believed that one or more of the packages burst during the flight.
A Portuguese woman in her 40s, also on the flight from Lisbon, was arrested on suspicion of drugs offences.
It is not clear if her arrest is linked to the man's death.
Toxicology tests have been carried out on the consignment found in the man's stomach, which reportedly had a street value of around Â£40,000 ($61,900).
Passengers said the man became agitated and then violent and had to be restrained.
A doctor and a nurse treated the man aboard the plane after he lost consciousness.
The captain declared a medical emergency and diverted the plane to Cork airport, landing early evening local time.
About 170 passengers and crew members were taken from the aircraft and were interviewed by police about the incident.

King Bhumibol Adulyadej has had a lengthy spell in hospital in Bangkok and has not been seen in public for months.
The king is widely revered and seen as an arbiter in the country's divided political arena.
Thailand is preparing to celebrate 70 years of his reign on Thursday.
The monarch was treated for narrowing of the arteries with "satisfactory results", the palace said in a statement.
Doctors performed a procedure known as balloon surgery to widen the arteries on Tuesday after tests had shown insufficient blood in the heart muscles, the statement said.
In the past month, the king has also been treated for a build up of fluid surrounding the brain and a swollen lung.
An X-ray on Saturday showed less fluid around the brain, the statement said.
The monarch's health is closely watched in Thailand as he is seen as a unifying symbol and pillar of stability in a society that has suffered increased political divisions and violence.
Cardiff Blues head coach Danny Wilson says it would be good to see Leigh Halfpenny return to Wales
[NEXT_CONCEPT]
A man who died after being restrained on an Aer Lingus flight to Dublin had reportedly ingested a number of small packages of cocaine.
[NEXT_CONCEPT]
Thailand's 88-year-old king, the world's longest-reigning monarch, has undergone heart surgery, the Thai Royal Household Bureau said.