MILAN - Inter Milan completed the signing of Brazilian youngster Juan from Internacional on Monday and reportedly also reached a deal for Colombia midfielder Fredy Guarin, as Serie A clubs strengthened their squads before the January transfer window closes.

A talented defender, Juan helped Brazil's under-20 team win the South America Youth Championship last year. Inter was considering loaning Juan to Novara until the end of the season, but has now decided to keep him in Milan.

The Nerazzurri also agreed a loan deal with Porto for Guarin for about €2 million ($2.6 million), according to the Gazzetta dello Sport. Including a full transfer at the end of the season, the total deal would reportedly cost €11 million ($14.4 million).

Meanwhile, Roma has signed Fluminense winger Marquinho on loan and former Juventus midfielder Ruben Olivera has become Fiorentina's fifth January signing after joining from Lecce.

Olivera, who has featured 11 times for Lecce this season, has reportedly signed a two-and-a-half year deal with the Tuscan club.

The Uruguayan was at Juventus from 2002 to 2010 but made just 39 appearances for the Serie A club and was shipped out on several loan spells.

Fiorentina has already signed Amauri, Guido Pizarro, Mounir El Hamdaoui and Kenneth Zohore this month.

The transfer window closes at 7 p.m. local time (1800 GMT) on Tuesday.

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