I think the following 3 can be considered smart signing by clubs - the best under the radar deals of 2019 which can turn out to be great value for money in future.
Julian Brandt
Borussia Dortmund have signed the 23-year-old German Julian from Bayer Leverkusen for about £22m. Last year was the best season of his career when he scored 7 goals and assisted 11 in Bundesliga. Looks like an incredibly good deal to sign this talented young player.
Thorgan Hazard
Dortmund pulled off another great signing of 26 year old Thorgan for around £23m to join the likes of Marco Reus and Jadon Sancho. Thorgan is Eden Hazard’s younger brother .
His 46 goals and 44 assists in 182 appearances across all competitions for Gladbach will prove to be a great addition.
Jay Rodriguez
Burnley secured the signature of 29 year old Jay Rodriguez for a £5m deal with West Brom. He has individually scored impressive 22 times in the Championship last season.