All in Domestic
Benfica could be about to break their club record for most expensive signing in history, which is currently held by Raul Jimenez.
Vitoria Guimaraes are set to strengthen their side by loaning in Croatian midfielder Filip Krovinovic.
Krovinovic struggled for game time last season, appearing in just 4 Primeira Liga games for Benfica spanning over just 36 minutes of football.
It came after he suffered from a cruciate ligament rupture late on in the 2017-18, which took him out not only for the last few months of that campaign, but also the first 10 gameweeks of this most recent season.
Porto are edging closer to completing the signing of French centreback Eliaquim Mangala.
The 28-year old, who played for Porto for 3 years between 2011 and 2014, didn't play a single senior game last season at Manchester City, having fallen down the pecking order.
Porto originally sold the French international to City for a fee in the region of 30 million euros in the summer of 2014, and he went on to play 79 matches for the English champions.
However, with heavy investment under Pep Guardiola, Mangala is surplus to requirements, and Porto, in need of increased depth at centreback with the sale of Eder Militão and Felipe, are to take advantage of his availability.
An agreement for Mangala, who has played for France 8 times, is understood to have already been reached between the clubs, and all that awaits is the medical.
Should no issues be identified, the signing could be completed in a matter of days.
Experienced centreback Ricardo Costa could be one of a number of players brought to Porto next season.
The 38-year old has just come off a season of captaining Tondela, leading his side to a narrow escape from relegation.
Costa previously left Porto 12 years ago at the age of 26, when he departed the Portuguese giants to join Wolfsburg after spending 6 seasons with the Dragons.
Indeed, since he last left Porto, he has played for 7 different teams from across the continent, from Germany to Spain and Switzerland to Greece. He even had a brief stint in Qatar for Al Sailiya.
However, according to the latest edition of A Bola, Costa could now be set for a surprise return to his former side, who are short of centrebacks after the departure of Eder Militão and Felipe to Real Madrid and Atletico Madrid respectively.
It is unclear whether he would be part of the senior side or the B team, the latter a logical option which would offer the younger players in the side a terrific leader and mentor.
Costa has played for Portugal 22 times in total - his last appearance for his country coming in 2014 in a 1-0 home loss to Albania in the Euro 2016 qualifiers.
Vitoria SC midfielder Tozé is to leave the club when his contract expires at the end of the current campaign.
Tozé has been a top performer for Guimarães this season, predominantly used on the right wing and contributing 5 goals and 3 assists in his 24 league outings.
His efforts have helped Guimarães earn a fifth place spot in the Portuguese top fight.
Some of his goals have been crucial, his strike against Sporting earlier this season the only one of the game, earning his side an impressive 3 points against one of the traditional "Big Three".
He also bagged a goal against Porto to help Guimarães come from 2-0 down to win 3-2 at the Dragão, one of the more surprising comebacks you're likely to see. His brace against Feirense also meant his side earned a crucial 2-1 victory over bottom-of-the-table Feirense.
It is no wonder, therefore, that Vitoria are keen on extending Tozé's contract beyond the end of next season.
However, due to financial limitations, meeting his demands has proven difficult, and with wealthier clubs interested in the 26-year old midfielder, it was always going to be impossible to keep hold of him.
Two clubs have emerged as frontrunners to sign Tozé, with current Turkish strugglers Fenerbahce keen on bolstering their squad.
Turkish table-toppers Istanbul Basaksehir are also interested in bringing him in.