Michael Hector has committed his future to Reading after signing a new three-year contract with the Championship club.
Watford have confirmed the signing of Austria defender Sebastian Prodl from Werder Bremen.
Michael Laudrup admits the biggest challenge of his summer will be to find another Michu and ensure Swansea are more clinical in front of goal next term.
Sunday's 3-0 home defeat to Fulham rounded off a memorable campaign in disappointing fashion for the Welsh club.
While the loss does not take the gloss off a ninth-place Barclays Premier League finish and Capital One Cup success, it did highlight how reliant Swansea have been on Michu for goals.
The Spaniard scored 18 of Swansea's 47 Premier League goals during a stellar first season in English football, but when he struggled to find the net late in the season, so did Swansea.
Laudrup is keen to return Michu to his favoured attacking midfield role next season, and Iago Aspas, Romelu Lukaku and Manu del Moral are all targets as the Dane looks to strengthen his striking options.
"In some games we have not been effective enough in front of goal and that's why we have to add some more goals," he said. "We scored 47 but I think we can easily add 10 or 12 to that next season.
"Again, a major part of that is that our goals this season have had the name of one person so we have to split the responsibility of the goals.
"But we have known that for a while and we have been working on it for a long time - but we know it is the most difficult thing to get someone to score goals."
He added: "It's difficult because, firstly, everyone wants players who score goals and secondly they are the most expensive.
"Can we get another Michu? I hope so but it's not easy. There are some out there but other clubs want them as well and we are not financially the most powerful of the 20 clubs in the Premier League. Goals are money and you have to pay.
"You can't think you can find a top scorer for free. We almost did it last year but you don't win the lottery every time.
"We hope and we will work and I may get excited when we get the one we want - but I know it is one thing to do the research, to put the name on paper, to think you have a chance, but it is another to sign them."
Fulham's win, courtesy of goals from Alexander Kacaniklic, Dimitar Berbatov and Urby Emanuelson, was their first in eight games.
Manager Martin Jol admitted he was disappointed with his side's tally of 43 points, but pointed to how perceptions of Swansea's season have been very different to Fulham's, even though the clubs finished the campaign separated by just three points.
He said: "If you look at our season as a whole, we had a very good first part, then we were inconsistent.
"We were very good again in the last seven or eight games, although we were playing fantastic teams like Everton, Newcastle, Arsenal, Chelsea and Liverpool.
"So to go to Swansea, who are a terrific footballing team, and win was fantastic.
"We now realise the difference between them and us was our home defeat to them in December because we were the better team that day.
"We should have been on 46 and them on 43 and they have been fantastic and we have not been so fantastic, but that is the Premier League. Everything is so close."