Sporting Lisbon president Bruno de Carvalho has claimed Marcos Rojo's move to Manchester United has been "wonderful business" for the Portuguese side.
United completed the signing of the Argentine international earlier this summer for £16m with winger Nani returning to the Portuguese club on loan as part of the deal.
The Sporting president justified the "wonderful" deal during the Soccerex Global Conference in Manchester on the topic 'How to run a successful club'.
"It really was a wonderful deal. A sale of a central defender for €20m (£16m) is a very good deal. It was the second-best sale ever for Sporting," De Carvalho said, according to Portuguese newspaper Record.
When asked whether they rejected offers for William Carvalho amid United and Arsenal's interest in securing his services, he said: "I have said several times that Sporting didn't want to sell.
"Could I guarantee that any club didn't meet the release clauses of the players? No, but also I said that I thought it was difficult that this happened.
"We have to be aware of the market and consider that that this is a different year for us. We have the target to be the [Portuguese league] champions, we are going to play [in] the Champions League and we can further enhance the value of our players."
Rojo ready for debut
Even though Rojo completed his move to Old Trafford on 19 August, the requirement to obtain a UK visa has prevented him from making his debut.
However, the Premier League giants confirmed last week they have solved those issues and the defender is eligible to play against QPR on Sunday 14 September.
Louis van Gaal's side host the London team in search of their first victory of this campaign, after securing just two points in their first three Premier League games while also losing 4-0 against MK Dons in the second round of the Capital One Cup.