Brighton have completed the signing of Argentine midfielder Alexis Mac Allister from Argentinos Juniors.The 20-year-old has signed a four-and-a-half-year deal with the Seagulls but will stay in the Superliga for the rest of the season.Argentinos confirmed in a statement Brighton have paid $9 million (£6.9m) for their 90 per cent share of Mac Allister’s economic rights. Article continues below Editors’ Picks ‘There is no creativity’ – Can Solskjaer get Man Utd scoring freely again? ‘Everyone legged it on to the pitch!’ – How Foden went from Man City superfan to future superstar Emery out of jail – for now – as brilliant Pepe papers over Arsenal’s cracks What is Manchester United’s ownership situation and how would Kevin Glazer’s sale of shares affect the club? Brighton boss Chris Hughton feels Mac Allister, who has made nine league appearances for Argentinos this term, will be a good addition to his squad for the 2019-20 campaign and beyond.”Alexis is an exciting young player that we have brought in for the future, and he has already made a big impact playing in Argentina,” Hughton told Brighton’s website.”It is in the best interests of all three parties to allow him to return to Juniors, as he will be able to continue playing regular first-team football in a very competitive league.”We will keep a close eye on his development over the coming months, and it is a pleasure to welcome him to the football club.”Who’s that man fromIt’s not Leo – but Albion have completed the signing of midfielder Alexis Mac Allister from @AAAJoficial. Breaking news brought to you by @eToro.#BHAFC — Brighton & Hove Albion (@OfficialBHAFC) January 24, 2019Mac Allister is glad of the chance to see out the season in Argentina before trying to prove himself in the Premier League.He said: “The main reason I signed was because they came to Argentina looking for me, and they seemed very convinced about me.”They made a big effort, told me about their project and their ideas to keep growing in this league, and I liked their ideas. I liked what they said. We kept in contact with [head of recruitment and analysis] Paul [Winstanley] and I was eventually able to come and sign everything.”I watch a lot of football and for me the English league is the best in the world. It is above all the other leagues. That’s the challenge for me, to be able to perform in that league and to bring my contribution to this team. I feel I am a player who really likes to get on the ball, that is my style.”I am really pleased I can go back for six months and help Argentinos, and these six months will help me a lot. I will keep progressing with my team and be calm in my head. I’ll be able to enjoy playing for the club which has given me everything.” Check out Goal’s Premier League 2019-20 fantasy football podcast for game tips, debate and rivalries.