Dutch central defender Arjan de Zeeuw completed his move back to Wigan from Portsmouth on Thursday. The 35-year-old had already agreed terms on a one-year deal and passed a medical, and rejoins the Premiership newcomers who he left in 2002.
He admitted his departure from Portsmouth was down to his poor relationship with manager Alain Perrin.
"Slowly everything deteriorated. The manager and I did not hit it off and I felt maybe it was time to go," he said.
The former Barnsley centre-half is looking forward to continuing his career in the north-west.
"The team have got a big job on their hands but we are certainly confident," he said.
"Wigan have bought players that other teams were interested in, we've kept the players that maybe other teams wanted to buy."
Pompey had wanted to keep De Zeeuw but Perrin had refused to promise him a regular first-team place.
Pompey chief executive Peter Storrie told the club's website: "We feel our hands are tied over this after the player put in a transfer request."
Jewell, who worked with de Zeeuw during the defender's last spell at the north-west club, was delighted with his capture.
He said: "Without doubt, he is the best professional I have ever worked with. There have been some good ones but he is the ultimate.
"I was very disappointed to lose him in the first place and while, yes, he is 35, he also retains a great desire. His fitness levels are high and he is a leader."
Wigan are also hoping to sign midfielder Josip Skoko, who currently plays in Turkey for Genclerbirligi.
Skoko's transfer is more complex as the 29-year-old Australian international needs a work permit to join Wigan.