The rapid Egyptian international was excellent against Spurs as Basle dumped the north London club out of the competition in the last round.
And Andre Villas-Boas was so impressed he dispatched scouts to watch the winger again, this against Chelsea.
Salah wasn't as good against the Blues, and Ashley Cole kept him largely in check before he was eventually substituted in the 78th minute.
The 20-year-old was named Most Promising African Talent last year, and has been linked with a move to the Bundesliga.
Basle signed the youngster from Al Mokawloon Al Arab last season, and the report claims they would want at least £10m for him now this summer.
And if he sorts out his wayward finishing he could be worth even more to his Swiss employers.
Basle coach Murat Yakin said: "If Mohamed could score as well, he would not be here any more."
A similar player to Spurs star Aaron Lennon, Salah would offer another option for Spurs who have missed the England international through injury in recent weeks. The club are pushing for a top four finish this term, and may move for a player who's scored six times in 33 games for Basle.
Spurs' conquerers in the Europa League quarter-final went down to a 2-1 defeat to Chelsea on Thursday night in the first-leg of the semi-final.