The ex-Spurs man says the 19-year-old is already one of Europe's finest
Alli, 19, has emerged as a potential Player of the Year recipient in what has been a magnificent first full season at White Hart Lane for the youngster, culminating in seven goals and five assists.
His form has undoubtedly helped Spurs establish themselves as serious Premier League title contenders as they chase a first top-flight crown since 1961, with Mauricio Pochettino's side three points behind leaders Leicester City.
Redknapp, who spent three years at White Hart Lane until 2005, admits he did not think had Tottenham had anybody truly special at the beginning of the season, but the ex-midfielder is delighted to have been wrong.
"At the start of the season I didn’t think there was anybody in his team to get me out of my seat. I was wrong," he told The Mail.
"Dele Alli — is there a better midfielder in Europe? Harry Kane has to go to the Euros and play. I didn’t even think this team would make the top four and look at them now."
Despite his age, the Lilywhites will be looking to Alli to help them past bitter local rivals Arsenal at White Hart Lane tomorrow ahead of what is arguably the biggest North London derby in decades.
Victory would see them go six points clear of the Gunners and give Arsene Wenger's side a massive task in order to bridge that gap, with just nine games to go after tomorrow's derby.