FIFPro Europe president Bobby Barnes said the January transfer window should be scrapped as it does not give value to all clubs.
Barnes said he believes having a short window penalises smaller clubs in need of cashing in on players for survival.
Although western European leagues are held as a shining example of upholding players' rights, Barnes said inequalities still exist in developing leagues globally.
"I've always been of the view that the mid-season transfer, the winter window if you like, puts a lot of pressure on people," the Englishman said.
"And I'm not sure how many meaningful transfers at the top level actually take place during that window in any case, because most of the top players, if they're involved in international competition, are unlikely to be transferred by their clubs anyway.
"Where it does impact is on smaller clubs who have a need maybe financially to sell a player, and knowing that come the end of January have lost the opportunity to sell that player, are forced to take less money than would be a true value on an open market."
Barnes said it was unfair that 28 per cent of football transfer fees worldwide went into the pockets of player agents and called for a cap to be put in place.
"I think there are very good agents out there and I'm sure they do very well for their clients but when you're talking about something nearly one third of transfer revenues going to agents then there's clearly something very wrong," the former West Ham, Swindon Town and Peterborough United player said.
"I certainly would welcome a capping on agents' fees.
"I would like to see a proper structure in the same way as if you were selling your house you employ an estate agent or a lawyer, they would be paid a certain amount for doing that job.
"I don't think I know many lawyers or agents who would potentially be taking 28 per cent of the cost of your house if they were effecting that transaction for you.
"I think we need to look at that a lot more closely because not only are we talking about agents fees, we're talking about money that goes via third party ownership which is also a massive problem."
|Liverpool loan Grujic to Cardiff|
|Mbappe: More to come from Neymar & Cavani partnership|
|Messi the greatest ever despite no World Cup win, insists Di Maria|
|Villa determined to earn place in Spain´s World Cup squad|
|Walcott swaps Arsenal for Everton|
|You even learn from Guardiola at home - Otamendi lauds Pep impact|
|Otamendi pens Man City deal to 2022|
|Neymar leads tributes to retiring Ronaldinho|
|Ronaldo must focus on playing - Zidane sidesteps exit talk|
|Zidane still an idol for James despite ´sad´ Madrid exit|
|Stoger will stay at Dortmund if ´everything fits´|
|Bordeaux´s Malcom facing disciplinary action over social media video|
|Ronaldinho retires – The greatest Brazilians to play for Barcelona|
|Athletic reward Williams with contract until 2025|
|Jones taking unlikely inspiration from City in United´s title pursuit|
|Moyes unaware of Chelsea interest in Carroll|
|Verdi wants Bologna stay amid Napoli links|
|Ronaldinho retires – A shining light of Brazil´s 2002 World Cup-winning team|
|Ronaldinho retires – a World Cup and Ballon d´Or among Brazil great´s prizes|
|World Cup glory and Bernabeu magic - Ronaldinho´s best moments for Barca and Brazil|
|Ligue 1 Review: Balotelli at the double as Payet shines and Malcom toils|
|Pato still dreaming of World Cup selection|
|FA Cup Review: Iheanacho makes VAR history, kit confusion reigns|
|2016-17 UEFA Study: PSG, Man City drive record-breaking spending|
|Conte packing in homework as Chelsea games stack up|
|2016-17 UEFA Study: Manchester United record highest revenue but largest debt|
|2016-17 UEFA Study: The headlines in transfers, wages and revenues|
|Iheanacho scores English football´s first VAR goal|
|Materazzi not surprised by Coutinho transfer fee|
|Ronaldinho retires - Brazil and Barca great plans 2018 farewell|
|Koziello swaps Nice for Cologne|
|Simeone ready to unleash Costa and Vitolo alongside Griezmann|
|Lambert ´never thought´ he would return to Premier League|
|Wenger ´very aggressive´ towards referee Dean, says FA report|
|Reported Arsenal target Malcom starts for Bordeaux vs Caen|
|Valverde not making big deal of Dembele´s latest Barca blow|
|Arsenal will have a ´hard time´ signing Malcom|
|Ronaldo and Madrid nominated for Laureus awards|
|Nantes´ Diego Carlos brands Chapron clash ´historic´|
|This is not important - Conte unconcerned if substitutions upset Hazard|
|Conte ´doesn´t think´ Chelsea have pursued Sanchez|
|Emery hints at Neymar return against Dijon|
|Mkhitaryan key to United-Sanchez deal, claims Raiola|
|Tevez: CSL spell was a holiday|
|Mignolet considering Liverpool future|
|Fred waiting for Guardiola call amid Man City speculation|
|Inter confident but patient over Rafinha|
|Giggs had counselling after Old Trafford exit|
|Neville: Mourinho would happily swap Mkhitaryan for Sanchez|
|Man United becoming Pogba´s team – Mourinho|
|Can ´talking with everyone´ but hints at Liverpool stay|
|Mourinho ´not unconfident´ Manchester United will sign Sanchez|
|Pogba warns City that United will not give up the chase|
|Assist king Pogba matches De Bruyne, Sane despite injury and suspension|
|Manchester United 3 Stoke City 0: Valencia, Martial and Lukaku trim gap at the top|
|Shaw feeling on top of his game amid United run|
|Mkhitaryan left out by Manchester United amid Arsenal talk|
|Inter secure Lopez on loan from Benfica|
|Hurst marvels at hat-trick maestro Kane|
|WATCH: Neymar nutmegging for fun in PSG training|
|Nantes´ Carlos has red card overturned after being kicked by referee|
|´Logical´ for Aubameyang to stay at Dortmund, says Stoger|
|Stupid not to - Giggs seeks Fergie´s advice upon taking Wales job|
|Suarez feared Chiellini bite would derail Barca transfer|
|Dortmund sign reported Man United target Akanji|
|Wales confirm Giggs appointment|
|Barcelona´s Dembele out for up to four weeks|
|Struggling Stoke appoint Lambert|
|Referee suspended until further notice after kicking Nantes´ Carlos|
|Coutinho´s ´deserved´ Barca move, says Figo|
|Fatigue the issue for goal-shy Chelsea - Conte|
|West Brom legend Regis dies aged 59|
|Mourinho: I don´t like feuding with managers|
|Puel confident of keeping Mahrez at Leicester|
|Valverde: Real Madrid haven´t given up on LaLiga|
|Ibrahimovic nearing end at top level – Mourinho|
|David is to keep - Mourinho wants new Man United deal for De Gea|
|Nantes president demands ban after referee kicks Carlos|
|Stoger sets out rules for Aubameyang reintegration at Dortmund|